Using our Welsh Pony & Cub Society passport and various websites we managed to get out Welsh B family tree back to somewhere in the 1850's. Mind you back then some of them were just "Mr Jone's brown mare". I felt quite a pauper his lineage was almost longer than mine.
Know what you mean, get that with my Crabbet arabs who trace back to the original imports by the Blunts. They even have posh pedigree certificates, I certainly don't! My dad is into family trees, but he's given up from my maternal great grandparents, as their surname was Smith, just too many of them.