Hello Graham,
I enjoyed your playing. It is a very catchy little tune. I was just mesmerized by the amount of skill you have moving your fingers. At times it looked as if you were playing the keys with the same motion someone plays the guitar. I ask knowing VERY little about the accordion, is this how you play it? I've been exposed to a lot of different aspects of music on here that I never have before. Thanks for posting it I enjoyed the listen...
Bawb

For the Arthritis, have you tried turmeric or cumin? Black cherry juice also helps with mine.