Whilst the US option can be seen as a cheap option, sometimes it can work out to be the most expensive overall when everything is taken into account.
If it is your intention to make your future airline career in the UK, then why not train in the home environment, with the familiar UK procedures, ATC and good old UK weather conditions.
If you haven't already done so, work out a pros and cons list, tied in with associated costs. List things like accommodation expenses, travel costs, possible car rental or public transport etc etc etc. If you can undertake your training in the UK, at a school not too far from home then you may find yourself quids in at the end of the day. Just thoughts, but hopefully they maybe a start for you.
Whatever you decide at the end of the day, it's your money and you look after the interests of number 1. Good luck and I hope all goes well for you.
Cheers D 'n' H