What a shame I missed it. Openreach caused a three month delay to my project by being crap.
They had a to do a b-end shift and upgrade of a fibre line. They came and surveyed, made a date and then came back and did it. So good so far.
Then the service provider called and asked if we knew why Openreach hadn't been in? I said they had and it was working, albeit not re-provisioned to the maximum speed of the bearer yet. The provider went away to talk to Openreach.
Then we entered a twilight-zone where Openreach claimed point-blank that the line wasn't installed and if we were connected to any line it wasn't ours and we couldn't use it!
This went on for a few weeks and finally, after sending pictures, we managed to convince them that the line was indeed installed.
The provider went away to talk to the actual hardware owner to get the bandwidth changed. Then they rang in a panic saying we hadn't paid Openreach hundreds of pounds for 'excess-construction charges' and they were threatening the fabric owner. Needless to say this was the first we had heard of this.
Cue more messing around for many weeks until both parties got in touch to say Openreach had given up trying to collect after being told this was 1. ridiculous, 2. unprofessional and 3. they didn't have a signed order for these extra changes anyway.
TLDR: Burn a bigger one next time.