Julian Cope presents Head Heritage

If you go on the National Trails website, there is a very handy distance measuring tool that I recently came across, which you can use anywhere (not just on a National Trail route).
http://www.nationaltrail.co.uk/pennine-bridleway/distance-calculator

I plotted at a circular-ish walk from Broadbottom up to Cown Edge, across to the Picking Rods then round by Brown Low and Ludworth Intakes and back to Broadbottom, it was just under 8 miles. I might not do the latter part of that loop anyway, so it would be less. Should be do-able though :)