I am sure you know this already, MI, but sitting down and writing a list of questions is helpful. I found that I would always come out not having asked everything. If you aren't able to go with DM suggest some questions for her.
Rose, safe journey back. It is warmer today, by the way, 19/20 up here in the frozen north.
Hatty, how about afternoon tea at Betty's for your DPs. As well as the shops and cafés in the towns, they have a café at Harlow Carr (RHS), and it might not be too difficult for your DM, ie park straight outside and go in.