It's not clear he has any real family in the UK; his immediate family all emigrated to the US in the late 80s and appear to have stayed there. He was deported back to the UK alone when he was released.
She has become estranged from her family and friends from around 2016. It seems to be related to MG; it could be that she disliked the judgement related to his conviction, or it could be a DV issue and he has isolated her from family and friends (more likely the latter IMHO).
We don't know if they've made any new friends since 2016 though. There are always those willing to help those trying to escape SS; the likes of Ian Josephs for instance. www.mirror.co.uk/news/real-life-stories/millionaire-helping-pregnant-women-flee-3850505