I have had one a few months ,back in a and e this week with another flare up im not sure it does anything for me

If you do have problems with circulation, it might be worth giving it a try. Many people have both heart and lung problems, so if you have heart problems as well as COPD, it could help you feel better. It is the cardio-pulmonary system, after all!

Thanks for that, although it seems to be a COPD thing reading the website

It's for circulation, which isn't very often something that is a problem for people with COPD. You might find a heart site where you'd expect to find more people with circulation problems.