Thanks very much BS,
Whilst I'm sure you are absolutely correct from an Openreach viewpoint (as they must be seen to offer all ISPs the same services to all their clients).
However many ISPs, if not all of them, who offer VDSL services set their own lower limits presumably as they don't want to consume their resources on those they consider very marginal cases without a Universal Service Obligation from Openreach.
I do appreciate that the call centre advisor has to follow a protocol but at least this one was prepared to look at the Wholesale checker (and smile) but was duty bound to stick to her mandatory script even to the end.
Kind regards,
Walter