Richard played Craig Parker in one episode of this BBC long-running drama serial shown in 2001. 'Casualty' started in 1986 and is still running on BBC1.
Richard appeared in the following episode shown on 29 December 2001:
Series 16, episode 17 - Playing with Fire
Episode summary: It looks like being a bleak new year for the Holby accident and emergency team as Lara finally finds Patrick and rushes him back into the department, where Max risks suspension in order to treat the heartbroken doctor. Meanwhile, Philippa feels the pressure as she struggles to cope with a staff shortage and ropes Lara in to help with a snakebite victim.
The episode 'Playing with Fire' was watched by 9.57 million viewers (source: Wikipedia)
The episode can be seen on youtube in several parts. The first part of the episode is below. Richard appears at 5m 30s.