Westminster doesn't have sovereignty on all constitutional matters in the UK

Canon Kenyon Wright does well to remind Ian Davidson that he is one of those Labour MPs who in 1989 signed the Claim of Right for Scotland confirming that "it is the sovereign right of the Scottish people to determine the form of government" for their country ("Wright warns MPs against bid to dictate terms of poll", The Herald, August 8).

Mr Davidson makes the common mistake of assuming that the concept of "the Crown in Parliament" gives Westminster sovereignty on all constitutional matters throughout the United Kingdom. That is simply not the case with regard to Scotland, and in the absence of a written constitution for the UK his assertion does not stand up to scrutiny.

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