XJ registration from Manchester. G registration was August 1968 to July 1969.
It was almost certainly a VAL70 with Bedford 466 cu in (7.64 litre) normally aspirated engine (earlier models were fitted with 6.17 litre 0.400 Leyland engines).
LXJ 574G no longer features in the registration database nor in:-
http://wakefield-files.freehostia.co...rdval-list.htm
http://en.wikipedia.org/wiki/Bedford_VAL
http://wakefield-files.freehostia.com/bedfordval.htm