I've been through all the threads - I think! And I have experienced some of the temporary "interference" issues mentioned.
The problem happened on my drive - I never have problems with thremote here!
My Sport wouldn't open today with either of the remotes. Think it's a Central Locking problem.
Does anybody know which fuse looks after the central locking - it's not obvious looking at the 3 (bonnet & each foot well) fuse box cover descriptions?