Didn't really need one but hey at £3 it will get used at some stage. There was approximately 20 in the Broadmead Bristol store when I left, this might be national - they are on the bottom floor to the left of the escalator.
From the website
Stainless steel casserole with glass lid. Fully encapsulated base for optimum heat distribution. With hollow stay cool handles. Suitable for all hob types, except induction hobs. Hand wash only.