They don't on their new 'totally unlimited' plans but I think that all existing plans prior to the change are still traffic managed unless you request it from BT which probably requires you to re-contract with them. I'm pretty sure BT don't use LLU as the whole point of LLU is to allow providers to use equipment
other than BT's.
Unlimited BT Infinity 2 Down 73.6 Up 9.7