As with most things that can pose a danger to your health, there are specific regulations for people who have to work at height. These regulations are there for your employer to make sure that any activities you are instructed to undertake that involve working at height do not pose a danger to you.
The applicable regulation is The Work at Height Regulations 2005. To cite some of the important sections of the regulations:
Organisation and Planning
4.—(1) Every employer shall ensure that work at height is—
(a)properly planned;
(b)appropriately supervised; and
(c)carried out in a manner which is so far as is reasonably practicable safe, and that its planning includes the selection of work equipment in accordance with regulation 7.
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