I installed FTTP on Demand (330/30) three years ago from Fluidone. It was on the old contract type (distance based, minimum three years) and had a pretty high monthly fee. So I was keen to move to a new supplier as soon as my contract was over.
My contract end date was 24th Jan. There were a few problems with my openreach database entry, and I had sent emails to a few potential providers -- including IDnet. IDnet support were superb explaining how to resolve the issues and I eventually placed the order for a 1000/115 FTTP on 31st Dec as a succession provide (migration).
I was given a date of 18th January. Given home schooling and video calls I was worried about an extended outage -- but need not have been.
My router logged a disconnection in the early hours of the morning but my fluidone connection was up still.
By early afternoon I was getting concerned about whether the transfer would take place (I was expecting my old connection to drop). IDnet told me that their records showed that the service was active, and so I reconfigured my router for my new IDnet password and instantly reconnected. Total downtime < 15 minutes.
Fantastic support and seamless migration!