Never mind the Guardian's typically biased headline that Corbyn is facing "Mounting pressure" over this (as opposed to the same old stuff from the same old sources).
This, from the letter to Corbyn, is truly bizarre:
It is clear to us that the Labour party’s disciplinary process remains mired by the appearance of political interference. This must stop. We need a truly independent process.So, a "truly independent process" is one where an independent decision is made by the people who have scrutinised the case and are empowered to make that decision; and then it is overruled because some people don't like it?
Williamson is a tool, but Watson et al are dearranged.