So here we are, Tom Hiddleston and me, in a boat in the middle of the Serpentine as the sun sets on a lovely autumn evening. He is doing the rowing. ‘Shall we turn the boat around?’ the star of Thor and War Horse says as we reach the bridge. ‘I want to go downstream, show you how fast I can really go!’ It’s almost embarrassingly romantic. If this were a date, I’d probably make my move right about… now. He has already told me he is single. He pauses from rowing to dab a bead of sweat from his curls, the handsome bastard.