Hi Pudding bowl,
Thank you for your reply.
I've just been for a swim.
I've noticed that when i'm standing up and i lift my toes up on my left foot (the sole of the foot still flat on the floor) all toes lift together but when i do this on my right foot (the one with the issue) the big toe is quite stiff and is lower than the others.
Going to take some ibuprofen.