OK - so while I'm waiting for further communication on the cooker circuit.........
One of the changes requested by the BCO guy is to provide isolation outside cupboards for oven and fridge freezer. Looking at my current wiring layout, the easiest way to do this is to use a dual box and a single.
The dual box will carry switched fused spurs for a kick space heater and the fridge freezer - the single box will carry the oven isolation switch. I intend to use a 50 deep box for the oven isolator to give plenty of connection/fiddle room.
The question relates to the dual box. I can't seem to find a 50 deep dual box, only 35. Into this box I will need to fit: For the kick space heater - ring in; ring out; thermostat out; heater out; connection block for thermostat return-to-heater. For the fridge freezer - ring in; ring out; fridge freezer socket feed out.
Is it realistic to terminate this lot in a 35 deep dual box, or is there a supplier of 50 deep boxes I've missed? Or is the approach to fit two singles close together?