I have read up on this question elsewhere, but as I have a tendency to over think and over engineer every little project I am asking here too 
I want to add a power socket into the loft to run a switch. To do this off a nearby socket would require trunking or chasing the wall out which I would rather avoid if I can. The boiler sits in the old airing cupboard on the first floor and would provide a neat route up to the loft.
Can I take a spur off the rear of the fused switched spur that feeds the boiler inside the airing cupboard? The boiler is fed by what would have been the old immersion feed, and has its own dedicated breaker In the consumer unit rated at 16a which I have tested. I.e I switched it off and only the boiler lost power.
If this is viable, do I need to add any further protection loft side or can I just add a socket in and away to go?

I want to add a power socket into the loft to run a switch. To do this off a nearby socket would require trunking or chasing the wall out which I would rather avoid if I can. The boiler sits in the old airing cupboard on the first floor and would provide a neat route up to the loft.
Can I take a spur off the rear of the fused switched spur that feeds the boiler inside the airing cupboard? The boiler is fed by what would have been the old immersion feed, and has its own dedicated breaker In the consumer unit rated at 16a which I have tested. I.e I switched it off and only the boiler lost power.
If this is viable, do I need to add any further protection loft side or can I just add a socket in and away to go?
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