A cowboy contract killer bungled a string of gangland hits after he offered himself up as a 'cut price' gun for hire.

Jobless Simeon Henderson, 27, agreed to take as little as £3,000 a time from mobsters to shoot their enemies after bartering with them on deals.

But he failed to 'smoke' one man as ordered by his paymaster and on another missed his victim altogether and as a result was ordered to carry out a third shooting for free.

Yet when told to merely scare a shopkeeper involved in a gang feud Henderson misfired his 1950s Czechoslovakian machine gun and accidentally sprayed bullets all over a store with deadly consequences.