This is a L4751 made before system 8 and was like the later F85 (same model but not as F84 ) not sold in the UK , this was a test truck to see if it could be sold in the UK , but instead the F86 was chosen (a 36 or 40 ton model ) for the UK 30 ton market , formally the Viking L485 , the F87 was not completely the same as the final F86 , the 87 had more refinement , the London Brick Company had run their manys AECS for five years life ... but the F86 changed this to seven years ! at least ! much lower costs with the Volvos