Graeme Cull, of Arden Partners, has won the magnum of champagne awarded by our sponsor Citigate to the winner of The Birmingham Post mid-winter share tipping exercise.

His share, Tanfield, stood at 50p when the stock market closed on Christmas Eve last year. A year later it finished at 134.25p for a profit of 168.5 per cent. Along with most of the stock market, Tanfield's shares have come back a long way from a peak of 211p earlier in the year, justifying Graeme's calculation that it was dramatically under-priced a year ago.

In the week before Christmas, though, the outcome looked close as KSK Power Ventur, a supplier of back-up generators for Indian businesses tipped by PAUL CUSACK at the Meriden stockbroker BRI, was closing the gap. Then Tanfield pulled clear on Christmas Eve.

Graeme originally cited Tanfield's attractions vaguely as "many new contracts contracts for its electric vehicles and access platforms".

"It is not a complicated business," Graeme explains. "They just seem to be doing it very well. They have switched the emphasis towards electric vehicles and started to produce decent numbers."

Demand for what he describes as Tanfield's "decent sized electric delivery vehicles" has become eye-catching. Marks & Spencer is ordering nil-emission electric vehicles for all its city centre deliveries. Sainsbury's is committed to switching its entire home-shopping fleet to electricity by 2010.