The Wrenn W.5501 British Sugar 4 Wheeled Tank Wagon was a Limited Edition wagon issued between 1989 and 1991 by Basildon.

Although the Limited Edition run was planned for 500, less than 300 were produced complete in reality. Each had its unique numbered certificate ie 146 of 500, came in a Period 4 Box with yellow cardboard insert. One box end was stamped in red ink;

W.5501 "BRITISH SUGAR" LIMITED EDITION

and the other left blank. Occasionally the box was stamped both ends (same stamp as above) and these are quite rare.

The most rare (and sought after) of the British Sugars is W5110 which are known as the Non Limited Editions.These used the same body/chassis combination but were issued without certificates in Period 4 boxes with yellow plasic or cardboard inserts.( late 1991/early 1992). The box was labelled one end with a typed label in black ink;

W5110 "British Sugar"

the label being stuck over the red limited edition stamp. I understand that no production records are available, it is believed however that approximately 20 of these (with correct labels)  are in circulation/with collectors.