Ground Force is a British garden makeover show that has been either sold or the idea sold all over the World.

The idea originally started out as two teams competing with each other in gardens that were side by side - with someone seated like an umpire at a tennis match keeping order over both teams. 

Unfortunately (or fortunately in this case) the Umpire in question was named Alan Titchmarsh - he couldn't sit still and kept leaping into action and ended up giving both teams a helping hand.

In those early days Tommy Walsh was polite and very business like, Charlie Dimmock wore a bra and looked like a librarian and Alan Titchmarsh hadn't really discovered his style of mayhem.

Then came a few changes to the format, they lost the game show aspect and concentrated on the garden makeover.  The team then gelled together until you have what's known today as Ground Force.

The basic premise of the show called for a team of gardeners and hard landscapers to be called in by someone (usually a relative to someone living at that address) to 'makeover' their garden as a surprise for their husband/wife/partner/etc in two days and keep it a total secret until the job was completed.