In a blog post, he says:

I do note, however, that the Tory leader explicitly invited the country to compare himself with Margaret Thatcher in 1979 – when she was “the novice” confronting the “experienced” Jim Callaghan during an economic crisis.

Ah, no actually, he didn’t. That particular narrative was set up by Brown himself with his conference speech, when he spoke the line:

everyone knows that I’m all in favour of apprenticeships, but let me tell you this is not a time for a novice

If he was not setting himself up as Gordon “Experience” Brown in contrast to David “Novice” Cameron, I don’t know what he was doing.