Hi Manse,
thanks for that, I see from your profile your in Essex, I used to live in Leigh on sea in the early 80's and then moved to Chelmsford. Had the 76 Pro then, fine guitar. The 78 I bought from http://www.vintageandrareguitars.co.uk in Bath. Where at this very moment they have a 1980 Pro for sale! £1695.
http://www.vintageandrareguitars.com/web/our-catalogue/Gibson/Electric-Solid-Guitars/item/6834