Among the plethora of makeover shows, Alan Titchmarsh broke new ground. Now he plans to hang up his wellingtons - and his decision could spell the death of BBC1's hugely successful Ground Force.

Ground Force was first aired in 1997 ... It continues to be presented by Don, who this year admitted TV gardening shows are a bit of a con. The horticulture presenter told Radio 5 Live: 'You ...