This is a superb example of the RARE  Wrenn W.5104 "Bulk Flour" 4 Wheeled Tank Wagon in White, running number No 20.  This was the only wagon that Wrenn produced in white self coloured plastic.It does of course have a metal chassis and metal rimmed wheels.

Introduced by Wrenn, Basildon in late Period 4 (from 1990), only 187 of these were ever produced. Please note; many have been seen in the "curly R " type W7304 copy  boxes, these were not issued by Wrenn please avoid.

The Wagon comes in a correct Period 4 (type W7304) box with a typed label on one end flap the other blank, and yellow cardboard insert.

Condition of the Tank/box is "near mint to mint" for their age.