Described at the time as ‘a most interesting occurrence’ by the Evening Standard, French engineer Marc Brunel probably felt he deserved a party, given that it would go on to take 18 years, rather than his predicted three, to realise his vision of digging the world’s first under-river tunnel. His creation would go on to be not as useful as hoped, only ever being accessible by foot and, soon after its opening, becoming a refuse for criminals and prostitutes. Before all that though, long before it opened, said ‘most interesting occurrence’ occurred with a lavish dinner for 50, soundtracked by the Coldstream Guards, who no doubt enjoyed some quite fabulous acoustics.