There are a number of "Parcs relais" close to metro, train or RER stations. You can find a map here:
Note however that some may be quite busy.
A better alternative is probably to take the train directly from Brussels to Paris. It will be quicker, you'll get directly to the city ...
https://www.ncp.co.uk/parking-solutions/london-underground-car-parks/ lists all car parks at London Underground stations, from where you can continue into London by Tube.
I don't know how busy these car parks typically are, but North Greenwich looks like the biggest one at a south-east London Tube station, and according to this page it'll cost £7.50 to ...
Dartford is already practically in London; you are unlikely to get anywhere much nearer. Trains from there go directly to Charing Cross, London Bridge and Victoria, which are right in the centre of town.
One rental company may require the IDP translation, while another rental company may not.
This Danish government webpage (it's in English) addresses getting a Danish license if one becomes a Danish resident. However, language at the bottom of the page suggests that a foreign license with English text might be acceptable for tourists. Here's a screenshot of ...
It seems that it is quite possible, as outlined in great detail here in this blog entry.
Buying a Used Car in Mexico as a Foreigner
Here is what we found out
straight away about buying a used car in Mexico: the only ones you’re
going to find for $1000 and under are mostly the old beat up VW bugs
you see everywhere. I’m not knocking it – I want ...