I did solve the issue with rear brake. After an overhaul they were fine but on checking later, rubbing a tad. Stripped the calliper again, found nowt wrong, so did a thorough clean of the slider pin & shaft the pin goes in, right in the bottom was some thick yellow grease, cleaned that out, greased the pin with calliper grease & all has been fine since. Teach me to skimp on a job eh.