Does 'unlawful' mean ...

[elderlyhippo]

... that Boris broke a law - and if so which one (or ones)?

... or does it mean something else?

I haven't seen in any news reports which law/s have been broken, so have been left wondering if it means something else and, if so, what

Yes it does. He wasnt allowed to prorogue parliament without a good reason - this was secured in 1688 with the Bill of Rights.

At least that is my understanding!

Boris hasn’t committed a crime, it wasn’t a criminal act, it was a breach of public law.

It explains it well here...

www.channel4.com/news/factcheck/factcheck-supreme-court-ruling-on-prorogation-explained

Yes the terminology is unlawful when the breach is not a criminal matter.

Thank you!