@Bertie68 - I also have arthritis in my knee. I've tried taking internal ibuprofen, but I got a little concerned about the side effects of taking it regularly. Then I tried some of the topical anti-inflammatory medication and found they just didn't work well.
Then someone told me about a topical cream called DynaFreeze. The main ingredient is the natural herb Yerba Mate that comes from a South American holly shrub. It seems to go deeper, acts quicker and lasts longer(sometimes six hours) than other topicals.
It's the best topical for my knee arthritis that I've found.