It unlocked after a short while but was painful. TD gave me a large plaster to put on when I got home. I had a bath to relax when I got in, put the plaster on and kept it on all of yesterday. I don´t have a single twinge now. It may be coincidence but just in case it isn´t what was the plaster (summat to do with herbs) and where do you get them??
And finally a great bit Thank You to TD