I have absolutely no knowledge of the sellers nor the rifles, but it being a dull day I thought I might draw UK forummers' attention to these two - if posting links to guns for sale is not allowed, apologies to the moderators:
Enfield No 4 T .303 Rifle | Second Hand Guns for Sale | guntrader
BSA SMLE #2 .303 Rifle | Second Hand Guns for Sale | guntrader