Originally Posted by
zebranz
If I arrive Term 5 can I take the connections bus to T4 and clear UK immigration/customs there? Is this the best way?
The following day I am going to IC Park Lane. Is it easier to go back to T 2/3 and take Heathrow Express and cab, or take Piccadilly Line to Hyde Park Corner from T4?
Yes you could go via the Flight Connections bus, so long as you arrive into T5 before about 21:30 hours and don't have any checked luggage. Otherwise there are about 7 free buses an hour from T5 landside to T4, bus 482 or 490, from bus stop 7 on the Arrivals level, very close to where you emerge from the baggage reclaim area.
I would take the Piccadilly line, it's just a lot easier than switching to HEX or TfL Rail. It's probably about the same time overall. If you have luggage just select a tube carriage seating area where the luggage area is near your seat. Remember to have a contactless payment card for the tube, or Google / Apple Pay.