Thanks all!
I will try to reconstruct and document the known history of this C15TA. Photos like Barry posted are very welcome.
Here is a photo I took of CZ4288021 while in Normandy in June 2009. Harry also brought it to Normandy in 2004 when he won a prize for "Best Armoured Vehicle". He was - rightly so - very proud of this, hence the event plaques attached to the nose of the truck.
One day I hope to bring it to Normandy, too.