Harry Simpson, 32, was arrested at a Morrisons car park in Peckham, London. He is accused of being a part of the assassination of Ardian Nikulaj, 51, who was gunned down in April this year.
Businessman Ardian Nikulaj, 51, was shot six in April. .Albanian detectives claim three Britons - including the mother of a seven-year-old girl - were involved.