This week we are talking hats. What's Fiona's favourite London hat? Celebrating National Hat day, and giving you time to prepare for London Hat Week. We've got a bit of a beaver update to start us off, and sadly their ancestors make an appearance in one of London's notable hats - The Beaverskin or Muscovy Hat of the Swordbearer of the City of London. The hat pocket plays an important part in one of the solemn and important (or, bonkers, depending on your point of view) City ceremonies.

We can't talk hats without visiting the hatters, and where better than Lock and Co. It would be quicker to list the stylish celebrities who haven't had a hat made there, than those that have.

What do you get if you cross a homburg and a Bowler? and bonus points if you know who might be wearing one. And where oh where was London's most unlikely hat wearer.

Plus mercury madness, Nelson's Olympic flame, and what do Chaplin and Churchill have in common?

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