As Rob said it's a toaster /5 series. Judging by the carbs I would suggest it is a 75/5 750cc.
If it's a 60/5 it has had its carbs changed. Only the 75 had diaphgram carbs. 60/5 and 50/5 had slide carbs.The one in the GSTourer's link is a R60/5

If it's a 60/5 it has had its carbs changed. Only the 75 had diaphgram carbs. 60/5 and 50/5 had slide carbs.![]()

Is there a shortage of razor blades in the Peak District?............just saying!!![]()

You soft Southerners wouldn't know about growing facial hair I suppose.![]()

I'd be worried about cooling. Doesn't look like there's any air flow to the cylinders.