On 05/08/2016 13:32, Maurice wrote:
On Wed, 03 Aug 2016 20:16:53 +0100, Phil L wrote:

The paving needs to come out and then be set back in after whatever
needs doing in the manhole

What puzzles me is: What are the screws screwed into?

The outer frame, this is concreted in.

If they are holding the whole lid down they would need 4 flanges
projecting horizontally into the cavity, which I'm not sure I believe.

They project outwards and are under the surrounding paving.