My apologies for using the term ‘passing the buck’. It is all rather frustrating.
I agree with you that the guidance in PG9 is clear - my concern is that the application of the rules by LR is not always consistent with the guidance, as evidenced by innumerable threads on the web, such as https://forum.alzheimers.org.uk/threads/it-appears-lpa-is-no-longer-enough-to-satisfy-the-land-registry.111992/#post-1580019
Because of this uncertainty I can see why some conveyancers are adopting a very cautious approach, requiring sellers to provide an assessment of capacity, which can be distressing to the vulnerable individual, not to mention costing c£500.
Although I imagine nothing can be done in my case, it seems to me that the LR should clarify its guidance such that when the LPA is straightforward (ie not restricted to the donor having lost capacity), there should be no need to provide evidence of capacity (or lack thereof) when submitting the transfer documents.
Until such a time as this guidance is provided I can see many conveyancers will adopt the easy way out of asking their clients for such evidence. That’s why I think your suggestion of challenging the conveyancer will not work (we have tried!), as they will just quote examples of where the LR has kicked up a fuss.
But I thank you for your help and your speedy responses. Hopefully you can escalate this so that such issues do not arise in the future.