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Terry Barker says nationalisation changes who owns the shares, it does not change the rules, while James Wallace says the powers to intervene already exist. Plus a letter from Philip Clayton

Andy Burnham’s instruction to officials to look at all options for Thames Water and not feel constrained (Burnham urges officials to come up with more radical options for Thames Water, 19 October) is welcome, but the options will fail unless they answer the right question.

Thames Water is not ill-regulated. It is extractively regulated. For 30 years the rules have allowed dividends paid from borrowing, debt loaded on to customers and sewage discharged into rivers as the cheaper alternative to investment. The creditors now asking for a further £2.4bn are not an aberration; they are the system working as designed.