1 hour 40 mins layover Terminal 5 to Terminal 5

I have a flight from Mumbai to London Heathrow, arriving at Terminal 5. My connecting flight to Baltimore-Washington International Airport (BWI) also departs from Terminal 5, but only 1 hour and 40 minutes later.

Has anyone experienced a similarly short layover at Heathrow Terminal 5? Any advice on how to ensure a smooth connection, considering I won't need to collect my baggage or go through customs/immigration.