We got ours to around 1485 (I believe); records prior to that were really sticky. Most of the parishes vital to the research didn't keep complete records....most of them didn't actually keep marriage records or full birth records at that point. It's a little frustrating at times.
There is still the rumour though that one of my great-grandmother's ancestors had an illicit child with a certain member of the royal family at that time...but I think most Brits try to claim that at some point.
Kind of like the overwhelming number of people who all appear to have been Cleopatra in a past life....