> we do have a constitution, it's
> just not all in one place and not
> regularly invoked by laypersons
I remain comfortable describing that as not an "
actual" constitution as most people would understand it.
> This makes it difficult to work
> out how constitutional crises will
> play out
That's circular. By definition a constitutional crisis is difficult to predict the outcome of, or it wouldn't be a crisis. The Americans also seem to have plenty of difficulty working out the application of their constitution.
> Is the Sewel Convention legally
> binding for example?
The UK parliament retains ultimate authority, and I've not seen any sensible argument to suggest otherwise...
> does the ECHR function as a
> constitutional guarantee of rights
> above Parliament
Ah, an excellent and interesting question, but in practice: parliament is able to withdraw from the jurisdiction of ECHR. Because it's sovereign. I will happily agree ECHR has been a massive win for the UK, but it's easily argued that in practice parliament has simply chosen to delegate some of its power to ECHR, as they maintain the authority to withdraw from it.