The problem is mate the people asking you to put 10 years on their certs don't even know why they are asking you to do so. You will find when you attend any meeting with Camden officials all you will get is some bloke rattling off a load of crap which he has had relayed to him by some other idiot who was told by Joe blogs.
I got queried once by one of their so called electrical engineers over a periodic report i did on one of their void properties. The report had about 12 code 1 departures and when he turned up to the meeting with his 'socket and see' plug top tester and got confronted with my MF tester, clamp tester and all my test equipment he chimes up 'Our other contractors never carried all this'....no wonder their properties are so bad and their tenants are forever calling the emergency call out number!