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The correct minimum fall of a flat roof should be 1:60 by design to acheive 1:80 with deflection ie sagging over time but with flat roofs with a gutter and no internal outlets to worry about over whelming the greater the fall the better. 6m/60 = 100mm difference between top and bottom

Try flaguk.co.uk they do a lead grey colour same as Sarnafil in a TPO or a PVC it goes down the same as Sarnafil, looks the same but works out cheaper comes with 15 or 20 year guarantee we use it all the time.