The Regulatory Reform (Fire Safety) Order 2005

1.  In applying measures to control risks the responsible person must, in order of priority—

(a) reduce the quantity of dangerous substances to a minimum;

(b) avoid or minimise the release of a dangerous substance;

(c) control the release of a dangerous substance at source;

(d) prevent the formation of an explosive atmosphere, including the application of appropriate ventilation;

(e) ensure that any release of a dangerous substance which may give rise to risk is suitably collected, safely contained, removed to a safe place, or otherwise rendered safe, as appropriate;

(f) avoid—

(i) ignition sources including electrostatic discharges; and

(ii) such other adverse conditions as could result in harmful physical effects from a dangerous substance; and

(g) segregate incompatible dangerous substances.