Thanks to you all for the positive feedback, new information, and offers enabling me to get it right. I only wish I had explored the Drivers Handbook details earlier.
When I did I initially got it wrong, thinking the first part of the service number was '13'. Therefore when Ed Storey was asked he came back informing it was not a Canadian service number as they were all prefixed with a letter. It was only when I was drafting my 'public information board' that on looking again I realised it was in fact not '13' but 'B'.

When Ed checked again we immediately found the service number related to J.Dickson who had served for some of his service with the 1st. MTVRD. I now have the correct vehicle serial for this vehicle and 50% of the correct unit signs, with hopefully the complete story before too long. I can also take the opportunity for a photo shoot at Bordon, where there were based for all of their UK life, as I journey south for our Normandy trip very shortly. I am currently putting the finishing touches and tweaks to the car plus packing the spares into the underfloor boot, sorry trunk, storage. I may see some of you over there the vehicle being quite distinctive. Will be at Arromances on the 6th, Port en Besin on the 7th and Bayeux/Tilly on the 8th plus a lot more.
I will try and get some outside shots if time and weather permits today, but sure as hell will have loads soon!
Thanks again for all the help and please keep it coming. Has anyone got any decent photos for instance of these LC424-C-PASS-1's in service? Funnily enough if you look in Bart's Historic Military Vehicle Directory, page 41, the vehicle serial shown in the photo is 4 digits from mine!
Yours Aye,
Ian