The advice has been published. You can read it here. Quite why it has been published on a government website when it is advice to the Prime Minister (instructing Peters & Peters, a reputable firm well-known to lawyers practising in the field of fraud and other financial shenanigans) is unclear. The advice is long and learned, with many references to Erskine May and others. But it is curious because it is based on one fundamentally flawed understanding and one (possibly unintentional) revealing one. The first is best set out in this analysis by Professor Mark Elliott, an eminent constitutional lawyer. In summary, it is that Boris’s lawyers are seeking to treat the Privileges and Standards Committee and its work as if it were a non-Parliamentary public body and saying that it is not complying with the rules applicable to such bodies. But that is precisely the point of the Committee: it is not a normal public authority but a Parliamentary one and entitled to set its own rules as to what it can look into and how. As Professor Elliott puts it, the legal advice is the equivalent of criticising a rugby team for not following the rules of football.