Can anybody recommend a reliable-honest Locksmith to change complete existing house door locks and also supply Master key system. The existing locks are fine just the inside bit to be re-set??.

I don't know any reliable/honest locksmiths but why take a chance with any of them, when you can go to Homepro and buy new lock barrels+keys including master sets. To change the barrel-key you need virtually unscrew a couple of screws slide off old barrel > replace with new and reassemble, a breeze, totally unlike initial lock installation that is a tradesman's job.

Contact the home alarm systems sponsor on this site. He may be able to advise

Thanks guys, will try both options, did'nt realize it was so simple to change the internals.

It is straight forward to change the lock internals, did it a couple of months ago, two houses in about an hour