Let me preface my question by saying I realise I am asking an 'it depends' kind of question and that on the day things could be very different. I am trying to gauge how busy Terminal 5 typically is around 9.30am on Fridays both in arrivals and departures. I am flying BA.
I'll be in London before flying to New York for a week. Upon my return, I am heading to CDG via LHR. I've got a window of just over 2 hours between flights. Flights are already ticketed.
Depending on how much luggage I have accumulated in London, I am thinking of leaving it at T5 left luggage so I don't have to carry it with me. I know it costs. When I return, I would head through immigration, straight to left luggage to pick up my bag and either check it in for the CDG flight or take it with me onboard. I am already ticketed.
I am flying at the pointy end, so will be off the plane quickly. I realise this does not guarantee I won't just join a long queue to get back airside.