Dear Adrian,

I cannot take leave of "The Ascent of Man" without turning my mind back to the walk across Paris exactly three years ago when we first determined to make the series. What a bold or foolhardy but splendid decision ! It has been a fierce and breathless time, and wonderfully worthwhile. The team you brought together has done us both proud, and your constant devotion, energy and invention have been (wait for it) crucial !

Thank you for persuading me in the first place, and sustaining me through the rigours and the ecstasies. To have all that excitement, and a marvellous series too - what luck !

With warmest thanks and friendship,

Bruno