BC referendum on changing electoral system

[Gary J]

If you have a MMP system, with enough proportional seats to ensure that the overall result is proportional to the provincial list votes, it would be unnecessary to worry about using ranked choice voting in the single member ridings or to be concerned about the exact riding boundaries. Even if the single member seats produce a grossly disproportional result, this would be corrected by the list seats.

[Gary J]

"Weighted votes" is probably unconstitutional in a Westminster system.

How so? The UK doesn't have a written constitution, it is merely a bunch of conventions. Queen Elizabeth can wave her magic wand, and it is so.

It is not quite true to say that the UK does not have a constitution.  What it does not have is a constitution formalised into a single document.

The UK constitution is partially written in statutes and  partially based upon the common law. The conventions are in some respects more important than the legally enforceable parts of the constitution.
 
What the UK constitutions boils down to is that whatever the Crown in Parliament enacts is law. It is the Crown in Parliament, not just the monarch alone, which can wave the magic wand and alter constitutional law as easily as it can provide for minor issues in the administration of the public services.

However, British Columbia does have a constitution written into one document. The constitutional provisions do not say that each member of the Legislative Assembly is to have an equal vote, but I imagine the courts would imply it.

http://www.bclaws.ca/civix/document/id/complete/statreg/96066_01#section18

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