Vic,
As far as I know from the last time I spoke to Ian there has never been trace of it found. In that case being such an individual model I would agree it was a professional job and probably filched for a private collector. I very much doubt it was taken for scrap. I wouldn't be surprised if in years to come it re-appears somewhere beyond our shores!
In the case of the loco from other info on the web it would seem it was presented to an antique dealer about 30 miles away from where it was stolen, said dealer declined to buy it but told the fellow it was worth more than he was asking for it…….!! It has also been said elsewhere that the car has been traced to its previous keeper only who sold it for cash some weeks back to "travellers". Needless to say they did not register new keeper details!
I would say the above suggests it was opportunist as if stolen to order they wouldn't be moving it on at a high street antique shop. Considering the vehicle I would guess the boys in blue would be pretty certain who was involved and there is a high probability they live currently somewhere in the area. However with no means of proof this will remain unsolved and with publicity both items will be subjected to an angle grinder and turn up at the local scrap yard. The law sadly only works against those that abide by it!
You never know who is looking at what you have! There are plenty of people only to happy to take it away from you even if they only get a fraction of its value! Sad thing is a lot of these things have a value greater than money.
Paul.