I realised that if you just want to search for £ or € you can use the browser search in page facility and then just keep hitting CMD-G (on a mac - not sure what it is for windows or linux) to 'find aGain' and very quickly scroll through the items for sale in the UK - well - the ones listed in GBP anyway!

It's not ideal, tend to loop around and sometimes your eye gets drawn to the right hand side of the screen when the search picks up a £ in the description, but it's better than eyeballing hundreds of irrelevant listings (sorry again to everyone in the EU).