Currency position GBP

Currency position GBP

I have just started a trial version and changed my time zone to GMT Greenwich Mean TIme as in London UK but when try and raise sales invoice it says my time zone is (GMT -8.00) Pacific Daylight Time (PST8PDT).
But mainly my GBP £ sign appears aftr my total ie. 562.35£   not £562.35 as should be for UK currency.

Please help?