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The solution here could not be simpler,

• Just hire a car in the UK (pick it up and drop it off anywhere you want), and

• Just hire a car in Europe (pick it up and drop it off anywhere you want).

(It's trivial to transfer between say Folkestone and Calais by train, or between any UK airport and say Lyon.)

It's completely commonplace to do this.

You'd be one of a zillion tourists doing it this year!

The idea of using one car for both UK/Europe is a non-starter, just forget about that.

Just some further points which go against what you say in your question:

1. Once you are on the continent save a massive amount of money by making a loop rather than a one-way rental.

https://travel.stackexchange.com/a/38154/19233

One-way car rental in Europe is fantastic, but it is incredibly expensive.

2. Whatever you do, in the name of goodness avoid the "living hell" major airports (all London airports, Paris). Fly to a city such as Lyon or Munich The quality of your life/holiday is boosted to a whole different level.

One of the great joys in life is motoring around the Continent. Enjoy!

For the record, note that it is no big deal to take a UK rental car to the Continent for a day trip returning to the UK ... if for some reason you want to do that. I've done this a number of times in both directions.

(Example, Sixt promoting the concept of a day trip! link )

Again, you would never do this for a longer tour: simply rent a car on each landmass. Enjoy!

The solution here could not be simpler,

• Just hire a car in the UK (pick it up and drop it off anywhere you want), and

• Just hire a car in Europe (pick it up and drop it off anywhere you want).

(It's trivial to transfer between say Folkestone and Calais by train, or between any UK airport and say Lyon.)

It's completely commonplace to do this.

You'd be one of a zillion tourists doing it this year!

The idea of using one car for both UK/Europe is a non-starter, just forget about that.

One of the great joys in life is motoring around the Continent. Enjoy!

Some further points:

1. Once you are on the continent save a massive amount of money by making a loop rather than a one-way rental.

https://travel.stackexchange.com/a/38154/19233

One-way car rental in Europe is fantastic, but it is incredibly expensive.

2. Whatever you do, in the name of goodness avoid the "living hell" major airports (all London airports, Paris). Fly to a city such as Lyon or Munich The quality of your holiday is boosted to a whole different level.

For the record, note that it is no big deal to take a UK rental car to the Continent for a day trip returning to the UK ... if for some reason you want to do that.

(Example, Sixt promoting the concept of a day trip! link )

Again, you would never do this for a longer tour: simply rent a car on each landmass. Enjoy!

The solution here could not be simpler,

• Just hire a car in the UK (pick it up and drop it off anywhere you want), and

• Just hire a car in Europe (pick it up and drop it off anywhere you want).

(It's completely trivial to transfer between Folkestone and Calais or whatever, or between some UK airport and Lyon or the like.)

It's completely commonplace to do this.

You'd be one of a trillion tourists doing it this year!

The idea of using one car for both UK/Europe is a non-starter, just forget it.

Just some further points which go against what you say in your question:

1. As many have said, save a massive amount of money by making a loop rather than a one-way rental.

https://travel.stackexchange.com/a/38154/19233

One-way car rental in Europe is fantastic, but it (usually) costs a lot.

2. Whatever you do, in the name of goodness avoid the "living hell" major airports (all London airports, Paris). Fly to Lyon or Munich or the like, and the quality of your life/holiday is boosted to a different level.

One of the great joys in life is motoring around the Continent. Enjoy!

Just for the record, note that it is no big deal to take a UK rental car to the Continent for, say, a day trip ... if for some reason you want to do that. I've done this a number of times in both directions.

Funnily enough here's Sixt promoting the concept of a day trip!

 https://www.sixt.co.uk/one-way-car-hire/london-to-paris/

(However, regarding the question at hand, note that Sixt state they do not have one-way rentals to the Continent.)

Again, you would never do this for a longer tour: simply rent a car on each landmass. Enjoy!

The solution here could not be simpler,

• Just hire a car in the UK (pick it up and drop it off anywhere you want), and

• Just hire a car in Europe (pick it up and drop it off anywhere you want).

(It's trivial to transfer between say Folkestone and Calais by train, or between any UK airport and say Lyon.)

It's completely commonplace to do this.

You'd be one of a zillion tourists doing it this year!

The idea of using one car for both UK/Europe is a non-starter, just forget about that.

Just some further points which go against what you say in your question:

1. Once you are on the continent save a massive amount of money by making a loop rather than a one-way rental.

https://travel.stackexchange.com/a/38154/19233

One-way car rental in Europe is fantastic, but it is incredibly expensive.

2. Whatever you do, in the name of goodness avoid the "living hell" major airports (all London airports, Paris). Fly to a city such as Lyon or Munich The quality of your life/holiday is boosted to a whole different level.

One of the great joys in life is motoring around the Continent. Enjoy!

For the record, note that it is no big deal to take a UK rental car to the Continent for a day trip returning to the UK ... if for some reason you want to do that. I've done this a number of times in both directions.

(Example, Sixt promoting the concept of a day trip!  link )

Again, you would never do this for a longer tour: simply rent a car on each landmass. Enjoy!

The solution here could not be simpler,

• Just hire a car in the UK (pick it up and drop it off anywhere you want), and

• Just hire a car in Europe (pick it up and drop it off anywhere you want).

(It's completely trivial to transfer between Folkestone and Calais or whatever, or between some UK airport and Lyon or the like.)

It's utterly commonplace to do this. You'd be one of a trillion tourists doing it this year.

The idea of using one car for both UK/Europe is a total non-starter, just forget it.

To go against what you say in your question:

1. As many have said, save a massive amount of money by making a loop rather than a one-way rental.

https://travel.stackexchange.com/a/38154/19233

One-way car rental in Europe is fantastic, but it costs a lot.

2. Whatever you do, in the name of goodness avoid the "living hell" major airports (all London airports, Paris). Fly to Lyon or Munich or the like, and the quality of your life/holiday is boosted to a different level.

One of the great joys in life is motoring around the Continent. Enjoy!

Just for the record, note that it is:

no big deal to take a UK rental car to the Continent for, say, a day trip

 ... if for some reason you want to do that. I've done this a number of times in both directions.

Funnily enough here's Sixt promoting the concept of a day trip!

https://www.sixt.co.uk/one-way-car-hire/london-to-paris/

(However, regarding the OP, note that Sixt state they do not have one-way rentals to the Continent.)

Again, you would never do this for a longer tour, simply rent a car on each landmass. Enjoy!

The solution here could not be simpler,

• Just hire a car in the UK (pick it up and drop it off anywhere you want), and

• Just hire a car in Europe (pick it up and drop it off anywhere you want).

(It's completely trivial to transfer between Folkestone and Calais or whatever, or between some UK airport and Lyon or the like.)

It's completely commonplace to do this.

You'd be one of a trillion tourists doing it this year!

The idea of using one car for both UK/Europe is a non-starter, just forget it.

Just some further points which go against what you say in your question:

1. As many have said, save a massive amount of money by making a loop rather than a one-way rental.

https://travel.stackexchange.com/a/38154/19233

One-way car rental in Europe is fantastic, but it (usually) costs a lot.

2. Whatever you do, in the name of goodness avoid the "living hell" major airports (all London airports, Paris). Fly to Lyon or Munich or the like, and the quality of your life/holiday is boosted to a different level.

One of the great joys in life is motoring around the Continent. Enjoy!

Just for the record, note that it is no big deal to take a UK rental car to the Continent for, say, a day trip  ... if for some reason you want to do that. I've done this a number of times in both directions.

Funnily enough here's Sixt promoting the concept of a day trip!

https://www.sixt.co.uk/one-way-car-hire/london-to-paris/

(However, regarding the question at hand, note that Sixt state they do not have one-way rentals to the Continent.)

Again, you would never do this for a longer tour: simply rent a car on each landmass. Enjoy!