Zimbabwean tribal dance groups, fly-fishing, knitting and building hedgehog dens. As hundreds more inmates are about to be released early, what's it's really like inside our 'overcrowded' jails: GRAHAM GRANT ⊕

The grand prisoner free-for-all has moved up a gear with plans to free more than 800 of them to tackle crowded jails. And there are plenty of hardened thugs among their number.