Ford Escort wont start

You'll love this one. For the passed year nearly every winter, my car will not start, even if you try and jump start her. I put the immobiliser key in and turn the ignition key and nothing, all dash board lights come on and you can hear the fuel pump kick in, but thats it. I can be sitting there for 2 - 3 hours before she decides she wants to go. I have had a new starter motor and the aa has stripped her still nothing. she is now getting worse and i can be stranded any where. i have also had the fuse back covered just in case of dampness. Any ideas please as now im desperate to sort this out. thanks