Apologies for the double post, I already
posted it in this thread on the UK & Ireland board but it is also relevant to this thread. I will integrate it in to the posts at the start of the thread when I get a chance.
So regulars may have noticed TfL barriers are now in place at the HEX stations around LHR. These have been turned on since SUnday 20 May. Previously you didn't need any card to use the HEX for terminal transfers but you do now. I saw the new arrangement myself today for first time - normally I wouldn't get the HEX between T2/3 and T5 but I went that way today. There are now dedicated ticket machines to get the free transfer ticket - you can't get the free tickets from the normal machines.
At T2/3 there only seemed to be one machine I could spot and that was situated just to the left of the barrier line.
Basically just select the number of tickets you want and press print.
Then just use the ticket in the ticket barrier and down the lifts to the platform. When you exit at the other station (for me it was T5) the ticket is captured by the barrier so you can't keep it as a souvenir
At T5 there were two free ticket machines I spotted down at platform level:
At ground floor level I couldn't see any free ticket machines, just the normal ticket machines, so at T5 it seems you can only get the free ticket at platform level.
Updated: as of late 2018 there are also now free transfer ticket machines at the ground floor level of T5 just before you head to the lifts for the HEX/tube
I haven't seen the set up at T4 yet, may try and head that way in the near future to have a look.
EDIT: just to add I assume like the tube you can use an oyster or contactless card instead to tap in and out, so getting the paper tickets isn’t compulsory.