Latest figures show the service has cut the number of such calls by 64% in the past two years, making it one of the most successful in the country.

The brigade uses technology as well as education programmes and youth initiatives to drive down the figures.

Callers arousing control staff's suspicions are questioned closely and warned of the threat of prosecution.

Julie Foster, supervisor at the brigade's control centre, said: "If we have a child on the line, for example, and know they are calling from a telephone kiosk, we warn them they are being recorded on CCTV footage."

Dave Turton, community education manager said: "It is now impossible to make a 999 call from a mobile, land line or a call box without the number and location being traced.

"If a repeat call is made from a mobile we send text messages warning of disconnection and if they continue we can permanently disable the phone and may even prosecute."