You say all this about the UK's constitution but it is not codified anywhere. Is it based on precedence, custom or generally accepted principle that it will happen this way if things do come to a crisis.
It all seems to be asserted resting on....on an uncodified constitution.
I'm a massive fan of an uncodified constitution. It allows parliament to have a great deal of flexibility and modernisation.
New laws can be iteratively created rather than relying on extremely old documents and lawyers/historians who attempt to decipher what was intended and how that relates to modern times.
If the US constitution was converted into a set of laws and then deleted, what do you think would happen? Attempts to be made to change the laws, some would pass, some would fail, but the passing of those laws would still be democratic if those making them were democratically elected.
It all seems to be asserted resting on....on an uncodified constitution.