Anyway there is a rather odd sentence in the piece:
The reason we should have disquiet about Harriet is because she is either thick or criminally disingenuous. My guess is thick. Being a bit thick should not disqualify someone from leading their party, I suppose, as both Iain Duncan Smith and Lord Salisbury would concur.Lord Salisbury thick? This the man whom Churchill described as "that mighty intellect" and is generally regarded as one of our most astute PMs ever.
I was going to write more on this subject but having just googled the subject I see that Jonathan Pearce at Samizdata has noticed the same bizarre sentence, so go and read his post instead.
I suspect that Liddle has seen an aristocratic PM and assumed that he must be some Bertie Wooster type of upper class twit but hasn't thought it necessary to actually know learn anything about Lord Salisbury before developing an opinion.