I believe there is a Royal Engineers base in Ripon. As Jack initially joined the RE it could be that he was based there before being attached to 2 SAS and that is why his address is given as Yorkshire
Sorry but as far as I can find out Les and John were not related. John (my uncle) was Crail born and bred and although I could not say for definate, but I do not think John ever resided in Yorkshire.
Have recently found out Jack was killed in Operation Keystone as a result of 'friendly fire'. He and 16 colleagues had been dropped in the Netherlands and a group of Dutch resistance thought they were Germans. A fire fight ensued and Jack and one of the Dutchmen lost their lives