Get him a Bioflow collar, they are magnetic and help to ease the pain in the joints. Have a look on ebay, you should get one on there. They cost about �30 give or take a few quid. They definitely make it easier for them to get up in the mornings, or when they have been lying down.
Also there are many supplements that you can give, Denes Greenleaf tablets are easy to get hold of, although if you go on to one of the dog pharmacy sites they will have lots of other items. Either vetmedic pharmacy or caninechemists,
and they will explain what each thing does.