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Does your trumpet go off-key in cold weather? It's a common problem, but one Welsh designer has come up with a solution to keep those jazz notes from warping in the harsh winter chill.

Cardiff's Ali Kedge had the idea for the Warmahorn when her jazz-singing daughter Ruby Samba was playing an outdoor gig, accompanied by trumpeter Jonny Bruce, whose instrument appeared to be going out of tune.

"Jonny told me how difficult it is for brass players to keep their instruments good when it's cold," said Ali.

"Ruby jokingly said, 'why don't you make a little coat for it?'"

The Warmahorn is now getting orders from all over the UK and even from Europe, and Kedge is testing out a range of cornet, trombone and flügelhorn sleeves with the Tongwynlais Brass Band in Cardiff.

Our jazz-loving producer Andy Roberts .