I got married in 2009 after my son birth they start creating problems my husband only listen his mother in absence of his mother he's mine but in front of her he's only her they lived in england now snice 4 month they send me back to pakistan and keep my son they don't let me speak to him but in my dreams I always saw him he wants to come to me but his grand mother don't let him come to me but at the end he come to me .I want my son back what will I do .

They can not "send you back" so go back to England they can not make you do anything.

Once back in England, hire an attorney, sue for custody of your child and divorce