By Josh O’Brien Gareth Southgate was very complimentary of England and Manchester United starlet Kobbie Mainoo after his full Three Lions debut. The 18-year-old was given the chance to impress from the start and he did exactly that, with Mainoo showcasing the kind of composure and technical ability that has made him a regular at Old Trafford so soon after bursting onto the scene. It was a late Jude Bellingham strike that spared England’s blushes and prevented two friendly defeats from two fixtures against Brazil and Belgium respectively. Youri Tielemans bagged twice for the Red Devils either s…