The Greenwich meridian was not marked at the site until 1999, when it was decided to mark it in deference to the upcoming new millennium. A trig point that was about to fall into the sea further along the coast was rescued and repurposed as a meridian marker at Tunstall.
It wasn't until 1999 that the Greenwich meridian was marked at the site, as part of preparations for the new millennium. A nearby trig point that was destined to be lost in the sea was salvaged and reused as a meridian marker at Tunstall.