When you applied for Building Regulations approval, what did you say would be the way that the electrical work would comply with P1, and how did you manage to get a Building Regulations completion certificate given what was actually done?
If you didnt have two great RSJ's craned into the house to support the floor of the loft conversion then you dont have a certificate from the building officer. You are not allowed to use the joists or strengthen them for a loft conversion any more
You need to be more sure than "pretty sure".im pretty sure i know what im doing with the spur, find a nearby socket with 2 wires goin in, test for resistance, if its ok 2 go feed 2.5 cable to my new socket
im pretty sure i know what im doing with the spur, find a nearby socket with 2 wires goin in, test for resistance, if its ok 2 go feed 2.5 cable to my new socket

Wiring a 13amp socket from a 6 amp circuit is dodgy and illegal no matter how old the building is
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