Richard Tobin wrote
Michaelangelo wrote

I would go around one or two dedicated bedding
shops and get advice from people who know.

Other customers, you mean?

Staff.

What would people who know anything be doing working in a bed shop?

They'd obviously know how many customers have a problem with a mattress they flogged.

And whether those who bought 10cm thick foam mattresses complained
about them a lot more than those who bought the thicker ones etc.