Yep, the sights have crossed my mind. Rude Fat Dog in Devon have a nice looking one with good looking sights listed on guntrader however...
I think this is a solid case of needing to set a firm budget and then going to see a reputable specialist (I'm thinking the devizes gunsmith as they're fairly local) to discuss the options.
I have to admit I would rather like an example of the rifle one of my ancestors carried in WWI (died of wounds suffered

) and as the rifle would be more "light" historical interest than an exercise in accuracy perhaps the rather nice BSA Commercial SMLE MkIII* devizes have in (or similar) would suit.