Among other roles, Kay has appeared in The Five (2016), Wallander (2012–15), Doctor Who (2015), New Tricks (2013–14), Frankie (2013), Public Enemies (2011), Wuthering Heights (2009), Holby City (2008), Midsomer Murders (2005), Spooks (2004), Prime Suspect (2003), Serious and Organised (2003), Silent Witness (2002), Conspiracy (2001), The Bill (2000), Casualty (1999), Shakespeare in Love (1998), Croupier (1998), Jonathan Creek (1997), Cracker (1996), The Vet (1995) and Minder (1994).