The URL:
http://svcs.ebay.com/services/search/FindingService/v1?OPERATION-NAME=findItemsByKeywords
&SERVICE-VERSION=1.0.0
&GLOBAL-ID=EBAY-GB
&SECURITY-APPNAME=YOUR-APP-ID
&RESPONSE-DATA-FORMAT=JSON
&REST-PAYLOAD
&keywords=url-encoded search phrase
&paginationInput.entriesPerPage=20
&itemFilter(0).name=ListingType
&itemFilter(0).value=Auction
&itemFilter(1).name=LocatedIn
&itemFilter(1).value=GB