Originally Posted by
astanley
If he clears immigration at T3, I believe he would have to take the Connect over to T5 from Central (free), and then hop on the Express at T5 (£25+VAT last I took it).
Almost correct - the HEX serves as the no-charge shuttle between the T1-2-3 (Central) station and the T5 station. The Connect serves as the no-charge transport to and from
T4.
Also, the one-way HEX fare is ~GBP 16.50, although there was (as of last month) a 14% discount available if booking online HEX tickets via the ANA website:
https://www.heathrowexpress.com/ana