Problem found. I hope!
Did this before & I was told by the breakdown service that the problem was either the battery or the alternator so got the new battery, had it serviced & the problem - supposedly - sorted. The mechanic at the repair shop said it was down to a dirty n corroded fuel pump. As I only bought the bike in October n hadn't really done many miles, other than riding it back from Kent in horrible weather, I thought that it was a feasible diagnosis. Obviously when it happned again I started to doubt that the blasted mechanic had even looked at the altenator, a view I'm sure of now as I don't think he took any of the side panels of the fairing off. Anyhow the problem appears to be 2 wires attached to the regulator that had snapped at the connectors. Have fixed them n the voltage coming off the battery is now what it is supposed to be. Fingers X'd that is it but won't know 4 certain till I go on another decent run. If it isn't the problem I will be back on sometime nxt wk........ If it is solved I will post my overwhelming joy lol!
Thanks 2 everyone who has helped x
p.s. The mechanic was at Speedwells in Radcliffe - Manchester, England. So be warned those of you who live in the north-west UK.