Bobblesack
Paul has two wheelchairs - the big electric one is for outside and it stays at the bottom of the stairs in a lobby. They had to have the doorway altered to accommodate it. He then has a stairlift to get upstairs, where he has a smaller indoor wheelchair to use in the flat.
And I'm ashamed of myself for knowing all this!
That solves the mystery completely. Well done. Thank you and don’t be ashamed for knowing the details. I must have watched the same as you but just forgot completely.


