I don't think you are alone Bonesie. I find myself asking the same thing for a few years now. I think I've put more miles on it getting it serviced and MOT'd than drives out.
For me it's the emotional attachment I have and being fortunate to be in a position that I feel ok just having it, but it is an expensive garage ornament to say the least!
Each person has their reasons to keep a car so only you will know if it's time to move on. However, as others have said, if you do sell it, wait until Spring if you can. I have pushed myself to get out in it more, however, for me at least it felt a bit forced so now it's just used for a short drive to grab a brew or a drive into town to run an errand. Not its natural environment to say the least!
Good luck
P
