'Deep Heat' heat rub. 'Effective relief from muscular and rheumatic aches, pains and stiffness.' Made by: The Mentholatum Co. Ltd., East Kilbride G74 5PE, Scotland.
I'm assuming that the cause of your knee pain is osteoarthritis (but you should check that with your GP). If so, this page is probably relevant:
https://www.nhs.uk/conditions/osteoarthritis/treatment/
(In particular, note the references to capsaicin cream and footwear).
well thanks for the wee answers. I had wondered why in the name of God am I suffering - when it dawned on me - that I did climb steps last Friday to clean windows with newspapers and vinegar. That's the culprit.
Mind you the window cleaners today undone all my lovely work. Will be getting up again, now I know what happened. Having said that I am in general pain from fibromyalgia - but sure that's the story of my life.