Ah....the joys of being retired and having time on your hands to do stuff.

After a forensic internet search, I've identified the type vehicle that hit my car.
This was all I had to go on.......
View attachment 493705
I've identified it as the lower part of the nearside rear lens from a 2013 onwards Ford Transit Custom (or Torneo).
I know the vehicle is silver.
I pity the driver if they think they've got away with it; they don't realise how dogged and thorough I can be - a throwback to my training.

I'll get the bugger!