Tom.
You are welcome. Please also be advised that "leniency" may be but integrity is not in any way compromised by the different system. LAA inspectors work for their love of the job, they ask little more than their direct expenses, their reputation is important to them. If you speak to a CofA maintenance organisation you may hear all sorts of opinions regarding "non approved parts" fitted etc. our system works on the principle of "Fit for purpose" as well as "approved" depending on the function of the part. The system is a delegation to the LAA who then regulate with the approval of CAA. Engineers are all qualified CAA certified engineers. All work carried out has to be approved, checked & signed for, both by the person who actually did the work and the engineer.
So if I were to mention that the door handles on my a/c came from B&Q DIY store, the stainless steel exhaust was welded/repaired by an agricultural engineer/welder. Please don't be alarmed!!! The tyres came from a CAA approved source at ~£1000 with paperwork.
Good luck.