addy played kevin snell in the 2006 revival of "donkeys' years" at the comedy theatre in london, and in 2007–08 he has appeared at the national theatre as dogberry in "much ado about nothing" and as hjalmar johansen in "fram". in 2011, he played vladimir, an nkvd officer, in "collaborators" at the national theatre, which also featured in the national theatre live programme, where live performances are broadcast to cinemas around the world. in 2016, addy appeared in richard bean's "the nap" at sheffield crucible with jack o'connell and ralf little, directed by richard wilson.