i wonder if you guys can help me, i think there tottally unrelated issues but they may be linked I'm not sure.

after all the heavy rain i found a nice puddle of water inside my car ( it doesnt normally leak so i just put it down to the unusual amount of rain) but heres where the problems started, they key got stuck in teh lock that day i had to take the lock apart to get the key out, but now since fixing that and drying the car out, i have noticed that the battery goes flat rather fast but i cant tell what the drain on the battery is,

its fine if i pull the fuse for the central locking and take the face off my radio so its one of those draining the battery, how would i go abotu finding out which one is the problem and how would i go abotu fixing it.

leave one still fused up, if it still goes flat you will know its the one with the fuse still fitted, if its not then it will be the other. my bet is on the central locking