The Highway Code references I provided were in response to you saying "...when parking lights *were* required". The inference was that they are now *not* required. As you can see, under many circumstances they are.
The reference I provided that linked to the
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website gives the legal definition of the lights you are required to show when parked. Therefore, if you are not showing those lights, under the circumstances where they are required, you are committing an offence.
If you are parked on a road where it is necessary for light to be shown, one light at each end of the vehicle, a light dangled out of the side window, or a parafin lamp hung from the door handle will not meet the requirements of the law.
Of course, the likelihood of prosecution is fairly slim...
Chris