All the quotes you have listed do not have any bearing on the issue of a full LGV licence holder doing refresher training with a LGV training school.
The law is very clear - Any full LGV licence holder doing refresher training with a LGV training school does not have an exemption from the EU regs and whilst doing such refresher training, the tachograph must be compliant - SEE HERE - I believe the VOSA HQ is at Bristol 
If you have any official information that can be verified to the contrary then feel free to post it or a link to it. 
instructorone:
I am not prepared to disclose the name of my source on a public forum,
That’s ok - perhaps your ‘source’ can give you the relevant regulation to post on here that refutes the info from the VOSA source I quoted 
