Just something I discovered the other day.
I rarely lock the vehicle anyway (virtually everywhere I park has an armed security guard nearby) and being as Land Rover Manila want nearly 450 quid for a remote, I've stuck with using the door lock. I have replaced the latch some time ago. So this is for those in the same position.
Anyway, I went to unlock it the other day and whoops, the key wouldn't turn. "Oh dearie me", I thought. Going to turn the opposite direction, and I noticed that the door handle bit with the lock in moved fractionally, and I mean fractionally. By dint of a gentle twist on this, the door unlocked with no problem. This bit is only held on by one torx head screw, accessible with the door open and if that isn't 100% tight, the lock section moves, et voila, stuck.
Positioned the handle section so the key moved both ways, tightened up the screw and problem solved.
It just may save someone panicking and thinking the worst.
Of course, in your case it may indeed be the worst, but now it may not, if you follow me.
Oh and please no, "Get a new fob or you will die" replies in a US accent please. :-)