The renewal of a Class they already hold. All the other instances you have quoted are for a new rating.
I would still argue that training for the renewal of a rating does not come under being a student pilot.
We are arguing semantics here I think. Unless the CAA are going to make a ruling it comes down to the head of training to decide. In my case I have decided there will be no solo element for the renewal of a rating. Other heads of training my interpret as they see fit.
