Ah sorry - I meant that the local currency used doesn't switch to GBP, it stays as USD for me, whatever I choose under "Local Currency". (In Chrome, not tested in Firefox/IE)
Same problem here. Local currency jumps back to USD constantly.
This glitch was reported several times by several users, but unfortunately it was never fixed.
Local currency now stays remembered for me, but "Label address" has stopped working on FF (works on Chrome, though).