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Obeying the instructions of a police officer is mandatory. Obeying the instructions of a civilian is optional.
Nope, the TMA 2004 creates the following offence (S.10[2]), therefore it's mandatory:
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A person who resists or wilfully obstructs a traffic officer in the execution of his duties is guilty of an offence and liable, on summary conviction, to imprisonment for a term not exceeding 51 weeks or to a fine not exceeding level 3 on the standard scale (or both).
A police officer gains their specific powers 24/7/52 from being attested in the Office of Constable, but other people also hold the powers of a Constable in certain circumstances - a Prison Officer whilst on duty, for example. There are lots of other situations where a civilian has various powers, including issuing mandatory instructions, and have been for years.
The TMA gives certain special powers to HATOs, and provides the teeth to back them up. Whether or not one agrees with their role, that is fact.
These powers are not some new creeping extension - the Fire Brigades Act 1947 gave powers to firemen and there were probably more types of office holder who could actually lock you up in the mid Victorian period than there are now!
On the subject of flashing lights on the highway, technically (Vehicle Lighting Regulations) police and HATO vehicles are the only ones which can carry red flashing lights to the rear - the only other red flashing light permissible IIRC is an identifying light (red/white checker) on a Fire Service control vehicle. Ambulances and other Fire Service vehicles do not actually have the authority, nor do the numerous recovery vehicles which carry them. There was a long debate, believe it or not, in the House of Lords about this very matter!
http://www.publications.parliament.uk/pa/ld200304/ldhansrd/vo040422/text/40422-13.htm
Incidentally, I think Fisherman is the sentencing guidelines oracle - not my field, I'm afraid.