Use this one https://mast-works.davwheat.dev/ put zoom out and look for your area and zoom in more often until u see OR on it.
That's interesting, at first I thought this was the standard one.network, but on their map it just shows Openreach as doing something in our road, this map shows it's replacing pole. Wondered why the road was being closed
So useful this thread, thanks everyone. I find this link shows Openreach works' descriptions, but bidb doesn't. Either way, both are great and amazing to see my mum's tiny village in Devon is getting FTTP.