AquileF,
Look no further than the Bristol & Gloucestershire Gliding Club (Nympsfield).
See bggc.co.uk
The club offers:
a. An LS4 and ASK21.
b. A 7 day week operation
c. Ridge & soaring in uncontrolled airspace. (UK readers, don't go off on a "Brize Airspace Grab" tangent.)
d. Wave if you get lucky.
e. Winch & Aerotow.
d. Basic accommodation.
f. A bar.
g. A cafe.
and probably more.
Best to check with the club to see what the latest LS4 solo requirements are. Probably UK Bronze with Cross Country Endorsement minimum, with satisfactory check flights to include launch failures and spin recovery.
Stop worrying about Brexit. Whatever happens, at the end of your stay you will have your LS4 flight time in your logbook. The CFI would no doubt certify the entries.