Hi there Nigel,
FANTASTIC! Thank you very, very much indeed. The colour and shape did hint at S&W, but I thought it was too good to be true. Of course I fell into the trap of thinking if it's got a bold modern cut and is turns out to be S&W, it must be Murray. Very silly, really.
What a lovely surprise - it is sitting, glittering on my windowsill now!
See you at Cambridge, no doubt, and so many thanks again,
Mark