Patch plasterboard over old box socket location.

[chivers67]

They look like the Push type Wagos rather than level type.

The Tape isn't really doing much is it?

I'd be tempted to just get some metal cover plates as the back boxes are recessed, replace the Wagos with Maintenance free boxes and tuck them in but really if the cable route is easy to find just run in new cable.

 

[sparkwright]

This is the bit where you get a piece of double capping, jam it under the lugs, and fill...

 

[securespark]

Quelle dîner de chiens.

 

[markyd1]

It is in a safe zone (thanks to the sockets below) so hiding it is fine as long as maintenance free connectors have been used.
Very good point from @chivers67 - your new cabling MUST be RCD protected (effectively RCD/RCBO at the consumer unit).

What is a maintenance free connector?.......Only maintenance free when enclosed in the appropriate junction box, and wago boxes are not made to be buried in a wall........./.Need to put a blank plate on the box