For reference: New DID Gold X-Ring 530 and JTF513.17 with JTF518B 6mm spacer front and JTR816.49 on the rear all fitted OK. I got a 120 link chain and after fitting cut it down to 114 links which seems to be correct, though the end of the swing arm is 1/2 way between the New and Replace indicators, so a tad too long but 112 would be too short.
I'll post details in the ED1 section for anyone else with a standard bike who wants to go to 530 chain so they now all the parts details and some images.
Cheers for help from those who helped
Rob