My wife is from England,and she does the same exact thing ! They use to give her speach excersizes in her school,so that they would not drop the h . This is one of them: " Hary went to Haringgate,Hary wore a hat,Hary's mother said to Hary "Hary,where's your hat". Hanging in the hall mother hanging on a hook. Hary's mother said to Hary "Hary,have a look".
It didn't work ! LOL