Thank you, Baggs (My keyboard keeps typing BNaggs, but I am sure you don't )
I am trying to use some of my fabric stash making things to list on Folksy. Quilted casserole cosies and Aga covers seem a good idea. No-one but me listing casserole cosies at the moment (which could be a good sign or a bad one)
Aga's own online shop has them 37cm diameter, but some other sellers make them 38cm. Aga are coy about what is between the front and the back, if anything, but Folksy sellers put in insulation, some polyester, some Insul Bright (polyester with metal fibres, and apparently more heatproof). Aga seems to have made them with loops once upon a time, but not any more (too much work, not enough profit?) and there are complaints on the website from buyers who prefer to be able to hook them on so that they stay in place when the lid is up and now they have to sew on tapes themselves.
If loops make them more attractive to potential buyers, then loops they shall have, but I don't know how big the loops has to be to go over the handle.