Welcome to T&B Forum,
Davey.
I would have thought that a Googoo search would find you a manual, probably on eBay or even Amazon at a push.
http://www.collectors-books.co.uk/be...pair-550-p.asp
Remember that your PJK was previously known as VAS5.
Very little will have changed from the earlier models to your later model.
http://wakefieldfiles.co.uk/bedford-vas.htm