LONDON (Reuters) - Aldi UK, the British arm of the German supermarket discounter, said it would trial grocery home delivery for the first time in partnership with Deliveroo.From Monday, the supermarket will offer a rapid delivery service from a store in Nottingham, central England, before extending the trial to a further seven stores across the East Midlands in June.If successful, the service could roll out to further Aldi stores by the end of 2020, it said.