This is most comprehensive and thank you, I have decided you must work for ASUS 
Interestingly, DrayTek take a different interpretation to the BT SIN 498 Standard. I have assumed over the years that it is a rule that they do not enforce unless the device in question is causing an issue, then the service can be terminated etc. (much like what you have stated, but from a slightly different viewpoint).
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Is it mandatory to use SIN 498 compliant products?
Yes; BT Openreach provide almost all VDSL lines in the UK (for all ISPs) and they do require the use of SIN498 approved devices. You are expected to have an approved device on the line in order that they can monitor performance/stability and in the event of any reported fault/problem so that they can eliminate any unknown hardware as being the cause. SIN 498 testing ensures that devices provide adequate performance a large variety of line types and varying line quality and comply with all requirements and features within the specification.
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https://www.draytek.co.uk/information/our-technology/bt-sin-498
In a completely sane world, madness is the only freedom (J.G.Ballard).
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