]I reckon that this is actually a Scammell that's had an Atki cab grafted on[/highlight].
Anyone? :-/
By, I was thinking the same, it does look odd. I looked up J Crow and came back with this.
Here is the history as recorded for the J. Crow Atki's. 
James Crow Snr purchased several bonneted Atkinson's, he retained the 6 wheel and the four 
wheeler for himself whilst One four wheeler went to Colin Noble for use with his 
slip and another 4 wheeler went to Marshalls Amusements here in Yorkshire (there 
could be more that he sold on) The Noble vehicle ended its days in the 
Hetton Le Hole scrap yard of Jimmy Monte, whilst the Marshall's machine was sold 
to a local farmer in York. The farmer although an enthusiast did 
nothing with the Atki only used around the farm for tree pulling etc. After 
severel attempts this Atki was sold and moved down South, I belive that 
restoration is on going or it could even be complete and out now. Both the 6 
and 4 wheelers that were still in Crows fleet were sold for scrap when James 
Crow Snr passed over. and both went to Jimmy Montes scrap yard at Hetton le 
Hole. However both were rescued the six wheeler minus engine. The four wheeler 
is still up North and is now preserved back into Pickfords livery and attends 
many rallys including Pickering. Restoration of the six wheeler 
is still on going I believe. If you want to see pictures of both the former 
Crow vehicles in their working days with Pickfords you need to try to find the 
now out of print book in the "Trucks in Britain"series titled Pickfords. I 
hope that the above is of information to you.
So maybe NOT a cut and GRAFT after all. 
 
  
 