Ed Sirett wrote

You've got to be trolling! There is no way that routing an electric cable
through the builders opening behind the inset gas fire box can be
compliant!

Well, tell that to the manufacturers; in the void are mains cables to the
boiler, a mains lead to the pretty lights on the front, a dial to turn
(boiler thermostat) and a button to press. (startup).

Also my speaker leads, still speaking after all these years.

--

mike