Oh hun, what an absolute a-hole this guy is!! I too have sadly fallen for one of these so called 'men'. They are so convincing that everyone buys their story
In this situation, I say jump on that plane back to London and don't ever look back!!! Your bub will be so much better off without him. And definitely have bub back home so that he can't use bub as a weapon against you, to make you stay here where you don't have your family for support.
You are a strong woman and you will be a strong single mother. Don't worry about finding love again, I know many single mothers who have married/remarried. You will find someone who will love you and your child.
Sending you HUGE virtual hugs!