I am traveling back to Ireland from India next month. My flight arrives at London Heathrow and next flight is in next 5 hrs from London Gatwick on the same day. I have valid Irish biometric visa marked BC on it. I am not sure whether I need to apply or not. Can someone please help me to conclude this . Thanks in advance
It does not matter whether you change Airports. An Irish BC visa lets you enter the UK to transit on the way to Ireland by air..
So you do not Need a UK visa