Good evening, Rusty!
I am glad that you liked your granddaughter's flat!
Is it local to where you all live?
She sounds very well organised, gathering her necessary possessions in readiness for her move.
I am sure she was delighted with the goodies you had bought for her?
I managed to finish the crossword this morning, apart from two parsings that I am still struggling with..........
Yes, you are right about 17a........
The answer is Barnet.
Barnet used to be in Hertfordshire but has since become a part of Greater London.
And there is a Barnet Fair!
It used to be an annual horse and livestock fair, but I think is now purely a pleasure fair?
It is held on the first Monday in September!
Also, "barnet fair" is cockney rhyming slang for "hair"!
And yes, a "baronet " is a Commoner! (as a baronetcy is not a peerage)
So you had it right on all points!
Incidentally, my parents lived in Barnet during WWII, until a bomb destroyed their house - whereupon they move back to Bolton, in Lancashire.