Of course there
are UK sellers who
do deliver within the UK on Amazon as well. Maybe it's the steep prices that make people look to the U.S. site
( The few UK mining vendors that still sell USB hubs seem to sell mostly the 20-port types for $90 if you're lucky or £90 if you're not. )
Here's a previous thread that you should have found:
https://bitcointalk.org/index.php?topic=348883.0 - UK / ENGLAND recommended USB hubs for USB ASIC erupters