Other kits for the MSWJR in addition to the Roxey kit:
Bill Bedford used to sell a couple of MSWJR items:
BBK 762/7 a 40' brake composite (ex-MR D263)
BWK 2760 Van No.303
I also have a white metal kit of an MSWJR 5-plank open with rounded ends of unknown provenance.
Slater's also sold PO wagons for Arthur Day and A. Vitti & Sons. both Swindon coal merchants with wagons registered with the MSWJR.
photo: Chris Rogers
All of the above are 7mm kits.
Tower also produced a Dapol wagon branded for Marlborough College 63 and MSWJR.
Powsides have done a Slater's kit for Marlborough College 64.
Other options listed here:
M&SWJR kits
There may be more but there's the nucleus of a stud there.
I do have more than a passing interest in the MSWJR!
Dave