Max Hasting, former Editor of the Daily Telegraph, and Boris Johnson's employer for several years:
.
“Boris is a gold medal egomaniac … his chaotic public persona is not an act – he is, indeed, manically disorganised about everything except his own image management.
He is also a far more ruthless, and frankly nastier figure, than the public appreciates. I would not take Boris's word about whether it is Monday or Tuesday.
He is not a man to believe in, to trust or respect, save as a superlative exhibitionist. He is bereft of judgment, loyalty and discretion"...
(Borrowed from @ColourMagic on another thread)