Just a thanks for the excellent information.
Did the throttle body balance on saturday, bit of faffing about as i made my own manometer using plastic tubing & red gear oil, watched a couple of clouds of white smoke disappearing from the exhaust, PITA refilling the manometer & getting rid of air bubbles, but all turned out good.
Used Guzzidiag, following instructions on this website, used the GRiSO 1200 8v setting, it reset the TPS to 4.6, did it twice to double check this was different to advised setting??.
Up shot is-an MPG improvement of approx 20%, before i was around 40mpg, now im near to 50mpg, that is of course UK gallons (4.5litres as near as dammit), bike is smoother, but not too smooth im pleased too say!!!, bike has now done approx 4300 miles, its a 2010, i think this is the first time its been balanced, no detriment to the previous owners, they were getting it serviced at the right times etc.
So pleased with results, all due to excellent info on here, also got leads from ebay as per info here, anybody needs to use them give me a pm, it'll only cost you postage.(uk), both ways.