Ok, the suspense is over. I have the Bathstore’s reply to my request for clarification. It is this:
Bathstore 20 October

Hi, the offer we are currently running is up to 25% on non sale items, this varies depending on the product. Thanks, Andrew

What I conclude from this response is that:

1. Andrew doesn’t understand the Bathstore sale definition either.

2. Andrew from Bathstore does not think I am funny.

3. My husband does not think I am funny either. He thinks I am slightly deranged. 

4. I amuse myself so that’s ok.