Keep an eye on airline guidance for terminal changes; adapt your route accordingly by alighting at the correct station

https://www.scribd.com/document/1074904087/Private-Hire-and-Ride-Hailing-to-Heathrow-What-to-Know-Before-You-Book-216958

Keep an eye on airline guidance for terminal changes; adapt your route accordingly by alighting at the correct station to avoid backtracking within the airport.