In my move before last, I measured up how many litres of CDs and books I owned as I stuffed them into rucksacks (80 litres of CD, 90 of book). In their current house move, Michael Frayn and his wife have estimated they possess 250 metres of books, prompting Alan Coren to desperately try to convert this measurement back into a number of units.
(By now I’ve probably cleared the 125 litre mark for books, despite a clear out on the recent move. The CDs haven’t bred as much and are only up to about 90 litres, with 40+ litres of comics despite my best Ebaying. Alan and Brian undoubtedly possess greater volumes than I, if they’d like to guesstimate the displacement of their collections I’d love to hear.)