So I have to trek over there again tomorrow (100 mile round trip) but
I'll come back armed with photos.

Make sure they know this, and that you will be submitting a claim for
expenses.

How old is your mum ? - you could get her to sign the new equivalent
of an enduring power of attorney, which would allow you to sort out
her affairs for her (sadly the new system is messier and more
expensive than the one it replaced)