Pru works at the "Windsor Lockwood Clinic". This is named after the character Windsor Horne Lockwood III, from Harlan Coben's series of books featuring Myron Bolitar.
Honeysuckle Weeks (Laura Marshall) & Don Warrington (Ray Kenwood) also worked together on episode 4.8, Unlike Father, Unlike Son (2015), of Death in Paradise (2011) as Mae Harmer & Commissioner Selwyn Patterson respectively.
Rade Serbedzija and Tom Cullen both appeared on Dowton Abbey.