Not just a case of drilling a solid stone wall.

It also means moving the furniture in upstairs office, lifting the carpet, pulling up floorboards....

Ditto in the master bedroom which is above the room with the smart TV in.

Also lift carpet and floorboards in landing.

The office is above the kitchen which is the room next door to the smart TV.

In a property this old, there is no dry lining so it's all thistle browning and bonding plaster.

All the beams are solid oak.

Too much labour involved to put in 10m of ethernet cable.

Even running ethernet outside is not viable as there is a 10m rum from smart TV to the outside wall and it would have to be weather rated ethernet cable.

So I can see why a 40 quid set of mains ethernet wall warts are cheaper and quicker than both the labour and materials involved in doing the cable run.