Thanks everyone. My mattress is quite new so I don't think it's that. I remember getting stiffness even in my 40s when I stood for a long time so this isn't a sudden onset but I've always thought it's part of the aging process. I do have good seating at work and I'm up and down all day so I think it's fairly satisfactory.
I think I will probably book a GP appointment and discuss it further. In the meantime I welcome anymore comments.
Last letters become first - March 26



