Europe's only banned theatre company - Belarus Free Theatre - have turned their focus to Russia, where Maria Alyokhina of the dissident protest band Pussy Riot was imprisoned. In something of a coup, Alyokhina herself joins BFT on stage here to relate the brutal psychological and physical mistreatment endured by her in Russian prisons. Strip searches - some while the prisoner is suspended from ropes - are apparently a favourite of the system.

The case of extreme political artist Petr Pavlensky - the man who nailed his scrotum to Red Square and who later set fire to the front door of Russia's secret service HQ in Moscow - is also represented, as is that of Ukrainian film-maker Oleg Stensov who has been jailed by a Russian court for 20 years on allegedly trumped-up charges of terrorism.

These three dissidents form the backbone of this pummeling, uninterrupted show. Each case is considered with heavy irony by a couple of suited Putin fixers.

Which artist should be released, and which incarcerated is a decision made in one scene while the duo sit opposite each other on loos. East European satire can come across as awfully heavy-handed in the west. But the cast evoke the brutality of the regimes they oppose by putting themselves through all manner of real and daunting physical hardship.

Some of the punches may be pulled, but they still leave their mark on the bodies of the recipients. State oppression is evoked by this physical theatre group's willingness to oppress themselves. It is hard to watch at times. But inescapable is the unshakeable, life-risking bravery of these artists - not only the ones whose cases are represented here, but the performers, too.