Lat & Long is available at Brizzel, has been for donkeys years but if you're south of us below certain levels, your SSR code could be masked by the Mendips so if you give us a correct Lat & Long, it could help pinpoint you.
Mind you, we found a C172 years back (when I was at Coventry) using the ERBM and an OS map with range rings drawn on it, when it went down north west of Stratford. We were close, pinpointed it to a field across the road. Warwickshire RFFS wouldn't accept the Lat & Long though, insisted on an address!
So we told them the name of the two closest farms and sent them on their way.