I have a valid F1 visa stamping on my passport. I am currently working and I have got my H1B approval notice. I am going to India to get my visa stamped. I am traveling by British Airways. I have a small stop over at London Heathrow and have to take a connecting flight to India from there. I don't have to change airlines or airport. I would like to know if I have to get the Direct Airside transit visa. Any suggestion is appreciated.