Having also been a foreign licensed Glider pilot(Canada), when coming
to the US its best to simply take the US training from scratch, if you
want a lifetime Glider Pilot lic.

Yep - that's my plan. I guess I will just learn a bit faster than a
completely "fresh" student would.

In your case all your book logged flight time is credited towards your
US lic.

Cool! I won't waste my two hours solo ;-)

Just bring your log book, and you will need to be issued a US student
glider pilot permit, takes about 15 minutes at your local FSDO.

What documents will I need? My drivers license will probably by
necessary... anything else?

BTW - can anyone tell me what are the main differences between soaring
in the US and UK? Aerotow signals? Checklists? Landing patters shape?

Thanks!
Bartek