306 xsi ph1 RCL problems

Hi all, hoping that maybe someone on this forum can help me as no one else seems able to do so? Recently my RCL started playing up - i could dead lock it (i have the fat two button with led fob) fine with no problem, but when i would come back to the car anytime later, it would not see me unlock it? therefore i use the key and alarm goes off. Now it has packed up altogether and the remote doesnt work at all. Obvious answer is its the key fob - which is the expensive option if its not. I am hoping that someone else has had this problem. My ariel leaked and so my courtesy light would fill up with water but i have sealed this and cleaned all the electrical bits up fine. Is it worth me getting another key fob?? General advice is always appreciated. Cheers:thumb: