Only just seen this thread, I don't know how I missed it earlier ??
For clarification purposes, there should be NO illicit attachments to Openreach telegraph poles, especially 240v furniture !!! As Starman has pointed out, we do have shared services in certain circumstances, but this will only ever be OR using the local electric board poles, not the other way round.
Back to your issue davidc ................ you need to contact your ISP and have an initial Broadband SFI fault raised. You need to ask for the ISP's tier 2 technical support to view your DSL logs, to confirm and build a picture up that it is indeed REIN causing the problem.
As 4candles has mentioned, the problem is always going to be the timings, with it being out of OR's working patterns, but from the initial visit at the very least you will have your circuits wiring tested and hopefully verified it is within quality parameters ?? From here, the same visiting engineer should then have a separate REIN task raised which will allow us to then try and arrange an out-of-hours visit and confirm it is the street-light causing the problem. We will then take it up with the local Council.
As far as charging is concerned, that it purely down to your ISP whether they pass the charge on from OR ?? I tend to find some do, some don't. But you need to keep mentioning the word 'REIN' when dealing with your ISP and insist it is put on their logs when raising a task, this should hopefully prevent any cost being incurred by yourself ??