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NotThamesWater-
Fireplace and mantel are original (although from looking at old pictures it seems that they were actually in the master bedroom originally and got moved by someone).
Alcove units and shelves were by these
https://www.lahartcarpentry.co.uk/
Very happy with them
aggi
Assuming you're never going to use it then yes.
I did it in a few spots here (green lines) for power, network and speaker cables.
Used a 20mm bit for the bottom ones and 10mm for those just carrying speaker wire. Put some conduit in the 20mm ones to make it smoother to shove stuff through.
Not sure of thickness, something upwards of 250mm I think.
Seem to remember I fished it through with a combination of rigid wire (earth cable I think) which I hooked with a coat hanger and taped the wire to the earth.