This is my idea, Shirley. In fact I will run it by you all. A supermarket car park might be quite busy on a Saturday. This could freak the puss(es) out. There is a university in Derby that is easy to get to and this is less likely to be busy so we should be able to transfer the cargo from one car to another in a bit more peace.
The location I am suggesting is University of Derby, Kedleston Road site, DE22 1GB. It is just off the A38. Let me know what you think..........