I have been a TalkTalk customer for many years (phone and standard Broadband). Four months ago we moved home, only just over a mile, and wanted to keep the same phone number. Initially TT said that it couldn't be done so I told them that I would change to BT. TT then agreed that it could be done and it was all set up. The move then got delayed, as they do, so I had to cancel the arrangements and then go through the whole rigmarole again which was frustrating but did work.
We moved on a Friday and would have to wait until the Monday for an Openreach engineer to come and reconnect the line. He arrived on time but warned us that it could be a day or so before everything worked. Five minutes after he left I had a phone connection and Broadband. Both BT and TT had done exactly what they promised and done it most efficiently.