Fog fell on Hampstead Heath as I made my way towards The Spaniards Inn for a festive pint. Where two paths converged a couple of very old fashioned young men passed me. They had extremely plummy accents and were excitedly discussing something scientific. The taller one wore a nicely tailored suit, overcoat and carried a hat as he strode forward purposefully. The shorter man struggled to keep up and half walked, half ran to do so. As they disappeared into the foggy distance they looked like Holmes and Watson cracking crimes on a Victorian winter afternoon.