On 12 May 2021 at 17:31:29 BST, "JohnP" wrote:

A month or so ago I posted a question about a tube that I had seen at the
bottom of telegraph posts. I realied they were on new posts.

I found out today that the tube is to allow BT to put a probe down to
ensure that the contractors had made the hole to the correct depth and
hadn't trimmed a bit off the bottom of the post if boring the hole was
difficult.

What is to stop them drilling a 20mm hole to put the pipe down a couple of
feet below the bottom of the pole?

--
Roger Hayter