The difference between the "51" and "41" models is purely cosmetic. The "51" models are coloured black on the bottom triangle bit and are exclusive to the Dixons group stores ( Dixons, Currys and PC World ). All the other retailers sell the "41" models. The ones that end in B are non Freeview whereas the BD and BDX models which are the same have Freeview built in. Some retailers refer to thos as BD and others as BDX. Essentially there are four models, a "51' with and without Freeview and the same for the "41" models. Personally I prefer the "41" models and own the 26" version, the LE26R41BD.