Michael Byng is like an ice-cream salesman to the anti types. They love bringing up his claim that the true budget is £100bn (+£30bn for CR2, £39bn for NPR, etc...) based on his analysis.
So I looked up his figures and said "yeah, I've looked at them and his analysis is incredibly flawed" based just on the evidence he gave to Parliament. But apparently, I'm wrong because I haven't read his full report, which hasn't been published yet.
I get a feeling that he's basically doing the "but I'm an expert" defense that the anti-vax movement love doing.
Incidentally, why is HS2's budget subject to a heightened scrutiny other major projects don't get? GWML electrification nor the Class 345s were accounted for in the headline figure for Crossrail, but there's a sizeable number of idiots who think that any infrastructure project that touches a city that HS2 stops at must be added to its total.