Well, I've got my car back and I'm pleased about that. I'm less pleased that there is a deep scratch on my rear bumper which means it's now got to go back in for that to be fixed.
Anyway, I had a long chat with the parts manager about getting another pump on order and while he wasn't being specific he suggested that I might be being a bit hasty as they may be obsolete at some point in the near future.
On the way home I decided to give it a bit of a run and it feels pretty much back to normal. I just hope that everyone else gets their pumps sorted as quickly as me.