This might be a coincidence but I was at a friends house in Bovill Road on Thursday evening and when leaving at around 11pm noticed a very large cat on the other side of the road, ( odd numbered houses). The cat fits your description and was noticeable as very handsome and larger than average. The white bit on its front was quite a large patch, more of a bib than a ' throat'. Hope this helps and you find him soon. I think Bovill is just around the corner from you- I saw the almost opposite no. 84 where my friend lives.

best wishes

roz