Hi there,
I've just posted a couple responses to similar postings just now. £60K Sterling is about $104K USD - so potentially your earnings are very very similar. You are quite right in that compared to Salt Lake City (im assuming that slc means that!) London is a hell of a lot more expensive! So I see how you'd relate your costs here as a 'loss' for you. In comparison though, £60K is almost three times the national average of £23K - so by most peoples idea, you'll be on a fantastic salary!
At the level you're at, I'd be pretty surprised if your company did'nt give you an allowance for the move, but as every company is different, maybe thats how yours operates. Logistically though, I'd have imagined the move won't be quite as tough, remember UK/USA are English speaking and we share many of the same trains of thought in these company moves of employees.
Like I've said in the other posts, do your research and sums and evaluate what you like in your current lifestyle and compare directly to those same lifestyle choices here in the UK - it may well be you can affrd everything on your 60K salary so as your standard of living remains the same! of course only you know your lifestyle choices!
Overall, good luck and congrats on your move!
Cheers! Dennis! West London & Slough UK!