[Mike]

It’s broader than that …the whole area of privacy
OFCOM
www.ofcom.org.uk 
BBC
www.bbc.co.uk 

But it’s not as restrictive as you may think !

and the College of Policing have an 'Authorised Professional Practice' on such matters as well:
www.college.police.uk 

APPs are national policies that all police forces follow, and base their own local policy on - the 'Code of Ethics' that is mentioned within the APP, which must be considered is a statutory code of practice made under the Police Act that forces legally have to follow.

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It's very common for those repeated daytime shows following police or bailiffs to be have a great number of reversions as more faces are blurred out over the years.

Don't quote me on this, but I'm pretty certain Mentorn and Potato used to produce two programmes, one for the time of first broadcast and one for repeat sales - the repeated version would have a strap at the start saying 'Programme first broadcast YYYY' and every member of the public would have their face blurred in the second version.