Filtering on Motorway

[fazersharp]

I don't buy that you should only use them stationary,

You dont have to take my word for it

116 Hazard warning lights. These may be used when your vehicle is stationary, to warn that it is temporarily obstructing traffic. Never use them as an excuse for dangerous or illegal parking. You MUST NOT use hazard warning lights while driving or being towed unless you are on a motorway or unrestricted dual carriageway and you need to warn drivers behind you of a hazard or obstruction ahead. Only use them for long enough to ensure that your warning has been observed.
Law RVLR reg 27

From here  https://www.gov.uk/general-rules-all-drivers-riders-103-to-158/lighting-requirements-113-to-116