You should get your FAA Instrument Rating before you head off home and do the UK equivalent. A lot of your FAA IR training now counts, and you will save a lot of money. You need 50 hours X-ctry time before you are eligible to take the FAA IR, so start going for breakfasts over the horizon. You have enough hours to convert to the UK PPL without any required extra training, though it would make sense to get some. Dual is always a good thing.