hmmm i would say keep it just now and wait for the better weather conditions to kick in. That is when you get the most fun out of your zed. I was in the same boat as you, had my car at 21 and thought it was extremely expensive to run BUT i fell in love as soon as i saw her. Dnt trade her in for a civic mate as there is so many kicking around especially in glasgow. Give the zed a chance in the summer, if its still not making you smile then defo move on. Just my opinion tho