Frosty
I do not know why you are so defensive of anything and everything to do with Toyota when it comes to problems.
DVLA are there to deal with legitimate requests for registered owners details or, in the case of DVSA, to investigate potential, reported issues around safety.
In this case, Toyota themselves have acknowledged a safety issue and have issued a recall notice, before DVSA even became involved (which should tell you something). Should an owner turn up on the doorstep of a dealer the recall issue should be dealt with. If not immediately, then at least an assurance that the matter is known about and will be prioritised, with a date to return asap for rectification to occur. Not some wishy washy 'dont know whats going on guv' scenario akin to an Arthur Daley sketch.
I accept that some sort of proof of ownership would be required by anyone banging on Toyotas fancy bi-fold double glazed doors, but a V5 should suffice, as it would contain all the details that DVLA would have anyway.
As you may have guessed, this particular issue strikes me hard. As a 2 wheeled veteran, the prospect of an Aygo rear door glass hitting a motorcyclist at 70mph (which is a perfectly reasonable assumption) suggests that certain individuals should consume a little more coffee and deal with it asap, not turn away owners at their doorstep with gaffa tape holding their windows in.