Hi there. We all sometimes wonder where our previous vehicles have ended up, So don't think that you are being too sentimental. I sometimes wish I still had my 2.8i Capri, but times move on.
According to the DVLA website, your 1989 Blue Astra was still on the road legally, until January 2006, and the last change of log book was later that month on the 16 January 2006.
We can only hope that someone has parked it up in there garage for a while and intend to get it back out on the road at some point. Fingers crossed.