I am planning two trips back to the UK from Australia, one over Christmas and one in the late Spring. I have found that booking the tickets differently can reduce the price I have to pay:
Australia - London - 15th December London - Australia - 2nd January
Australia - London - 15th April London - Australia - 15th July
This is the regular way I would book all my flights with each flight containing the way and way back.
The thing is, if I book my flights like this, the price is much less:
Australia - London - 15th December London - Australia - 15th July
London - Australia - 2nd January Australia - London - 15th April
As you can see the first flight encompasses the entire trip with the middle bit being a return flight from London.
The reason that this is less is because there are less English who want to fly from the UK to Australia after Christmas and more Australians who want to return from England then.
I am wondering if there are any problems with booking flights like this? In my head it feels that it should be ok (eg: if I wanted to pop back in the middle of a trip for a funeral) but it also feels strange leaving the country on a different ticket than that which I came in on.
It is worth noting that I have a British passport and a valid Australian visa meaning that there shouldn't be any issue with me coming in and out of either country.