This is a great example of the Wrenn W.5090 Guards Van (ex LMS) in grey, running number B950127. Issued by Wrenn, Basildon in Period 4 (circa 1988), only 338 were actually produced which is quite a small quantity before closure in 1992. The early issues had a typed label on one end of the box but from 1989 the full stamp was used. These examples have the full stamp..

Comes complete with P4 (type W7304) box and split  yellow plastic insert.

Overall condition is "near mint"  for their age.