> I've noticed that some trigpoints are tagged with a reference prefixed TPUK
I should also have said in my first reply that the page for each trig on the trigpointing.uk website gives the source of the OS data that it uses and shows the OS names. For example http://trigpointing.uk/trig/4791 describes what the site calls TP4791. According to that page the position data is derived from https://groups.yahoo.com/neo/groups/trigonomy/files/OS%20data/. The original OS name was TQ47/T218 and the new name is TQ47T218. So if a trig is referenced on the map using its trigpointing.uk name, you can look up the OS name via that website. Since all the pages have the same form, with a bit of scripting trickery it should be possible to scrape the conversions from the same website and fix them all in a batch. The OS uses accurate GPS these days so they don't maintain their trig point list. The main purpose of the trigpointing.uk site is to maintain up to date reports on the state of the trigts - some are destroyed and a few are still in one piece but not in their original position, due to subsidence. I think that these data do belong to the site owner, so his permission would be needed to annotate the map with them. As I said in my first post, he may well be willing.
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