This thread was opened by a nurse on Band 5 who manages an Equipment Library. At the link provided by Cyberdog, we find that (the elastic) Band 5 stretches from 20,710 to 26,839. Such are the facts.

Personally, I would be content with half of the median* of that spread. frown

* Median : those without a university degree may need to look that up!

If you don't inspect ... don't expect.