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If you are pulling the old cable out, just tape the new cable to it. You can either tape them end to end - Butt jointing or strip the outer insulation off to expose the inner wires and plait them together before winding some electrical tape over. Leave yourself plenty of slack and you can then cut off the bit you used to pull the wire and re-terminate.
If you are worried about attaching - terminating the connector, it really isn't that hard. The tool is £10 from Screwfix, the tester about the same amount and the connectors and cable are not expensive either. Watch some youtube videos and you should be fine.
Drilling a large hole is not an issue. Pipes and cables should run directly up or down from heaters and radiators and you would be quite unlucky to hit a random pipe not associated with the heater. You can also get a pipe / wire locator if you are concerned. You will want a large power drill - SDS would be preferred, and a long drill bit. Start slowly so you don't crack the plaster and then apply constant pressure through the brickwork, withdrawing the bit now and again to clear debris. |
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