What additional work needs carrying out? have BP said what that will cost.
This is the trouble with these charger installations, you are expected to fill in a questionnaire and take a few pics. Then when they turn up to do the job you are hit with: this job is not as straight forward as we thought and it’s going to cost more!
If these companies employed a local guy to pop in and do the survey themselves and quote an accurate price to start with it would be so much better and folks like me would be happy to order one and even pay out of my own pocket for the job.
But no that’s not how the system works, you provide info and pay up front only to find you could be in for hundreds extra to get the job completed.
That’s why I am reluctant to bother and instead use the local public charge points that are in my local area and put up with far less hassle by going to a charger once every 7-14 days for a 30-40 min charge.