You should be able to use any of "Slough, UK", "Slough, United Kingdom,", or "Slough, England" and the system will identify your country as everything after the comma. It should then search for your query exactly and for what it identified as your city, performing API calls on both users and items, for a minimum of four queries. Sorry about it not getting your correct location in the first place, the best GeoIP database available has only about 61% coverage in the UK.

I suppose the right thing would be for the system to identify England, Wales, Scotland and Northern Ireland as United Kingdom "States". Ideally that should apply to other places and islands like Corsica (France), Sicily (Italy), Mallorca (Spain), etc.