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I used to do a lot of work for a landlord. When i fitted mirrors i fitted them so my face was in the middle of mirror (im tall) when he looked in mirror (he was short ) I always had to move the mirror.
BPEC CEN1 Guidance regarding roof installation of a gas boiler is:
Flooring provided to the boiler for service access
The boiler has to be mounted on a wall capable of withstanding weight.
Loft to be accessible with retractable ladder
Must have fixed lighting in place