When looking at floor mats on Rimmer's website ( https://rimmerbros.com/Item--i-GRID018580 ) I noted that they refer to, for example, 'model up to CH321214’ or 'from BH220687 up to CH321214’ . Presumably the numbers refer to the last six digits of the VIN but to what do the letter prefixes relate?

Try this link for VIN explanation.

https://www.freel2.com/forum/topic33948.ht...lander+vin FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 76k+ miles) (MY2015)

Thanks for this - a useful reference but I still can’t work out the significance of the ‘CH’ and ‘BH’ referred to on the Rimmer website.

I think B = 2011, H = Halewood.
I think C = 2012, H = Halewood.

When I look again at the explanation IanMetro linked to, the B or C are Diesel and Diesel with DPF, but these letters are separated from the H for Halewood by two digits. But the first of these is a check digit, and the second is year of production so i suppose it’s sufficient for all practical purposes to simply use C or B, followed by H (which applies to all U.K. cars presumably) followed by the six digit chassis number.

Thanks, all