Some of BT's early fibre rollouts were... interesting. In particular, there were various unlucky people who ended up not being able to get broadband at all because they were on BT fibre - as in, not even 512kbps ADSL, just nothing. That's because BT rolled out an ancient ancestor of current fibre technology called TPON that worked almost the same way as current fibre-to-the-home but was literally telephony only. They eventually ended up replacing a bunch of this with new copper runs just so they could offer basic ADSL.