Well, you would not pursue because 1 year is not much to make an informed decision or you would not pursue for another reason?
Because let's say I delayed 1 year and applied to UK next year. There are plenty reasons for going to the US even if I will apply to UK:
1) One year of money to live off from philosophical activity.
2) Trying out the US. Maybe my partner will like it.
3) Traveling to US. We've never been there.
4) Chance to get LOR's from the US department. Never hurts.
Reasons for not going:
1) Plane tickets and other means that will be used to move to US in the first place. Then again the scholarship is money out of thin air so for me its benefits are greater than the money I spent for the tickets etc.
2) The gap will have to be 2 years instead of 1. But I think we'd find it still bearable, and I don't feel the urge to finish Ph.D. immediately and join the market.
3) ?
If I manage to get accepted to the US university, I believe I have a fair chance to get into at least a PGR 2.5+ university in UK. But if I don't get admitted, then my girlfriend knows my career is very important for us and I know she will let me finish the Ph.D. in the US. So if I don't go to US in the gap year and don't get admitted to the UK the next year, then it is worse for us compared to going to US and her being (relatively) unhappy.
To me the best solution right now seems like going to the US, trying it out for 2 years. My gf comes after I settle in, and begins living with me (maybe applies an MA of her own, she has better academic background than me in Sociology and Politics). If we don't like it, I apply for the UK 2017 admissions. Meanwhile I get teaching experience and LOR-level relations with some of the people in the US university. If she hates it, she can stay in the home country for most of that 2 years. I know we can manage 1 year of long distance. If I don't get admitted, then that means I wouldn't anyway for 2016 so we suck it up until I finish the studies in the US university.