Interesting that another letter purporting again to be from an anoymous Tory backbencher gained little traction last week and has thus now appeared on the left-leaning FT. How did they get the text when ConservativeHome couldn’t? The whole thing reeks of Labour dirty tricks again and the fact it appears on Commons paper makes Guido wonder who could the author be?

The letter picks up on media angles such as “We can’t go on like this” and the continuing drip drip of bile toward Steve Hilton making the authenticy look more and more dubious. Who has a track record in this sort of thing?

Guido’s top suspects:

• Alastair “Dodgy Dossier” Campbell
• Tom “I ♥ Dirty Tricks” Watson
• Damian “Gents, a few ideas…” McBride
• David “I’m Back!” Taylor

Your suggestions welcome…