Most of the ABC Television episodes (seasons one through three) are lost, while the Thames Television episodes survive intact. The only ABC episodes to survive are Nobody Kills Santa Claus (1965), The Morning Wasn't So Hot (1965), Don't Forget You're Mine (1966), Works with Chess, Not with Life (1966), and The Bromsgrove Venus (1968)
First seen in Well-There Was This Girl, You See... (1971), the framed artwork given to Frank Marker by Nell Holdsworth, which decorates his offices thereafter, is an 1823 representation by John George Murray, of "The Trial of Queen Caroline", when the Pains and Penalties Bill 1820 was pushed through and passed in the House of Lords at the bequest of King George IV in an attempt to discredit his estranged wife. Its title is fully "View of the interior of the House of Lords, during the important investigation in 1820."
Frank is given a display case of fifteen pinned butterflies by a grateful client as part-payment for his fee. He has this in his Birmingham office and takes it to his short-lived Brighton premises. It then hangs in his Windsor home (as seen in The Beater and the Game (1971)) before being displayed in his High Street office in John VII. Verse 24 (1971). This is a nice piece of visual continuity although the box does actually differ slightly between the ABC and Thames episodes.
The location building used as Frank's office in Eton - 93 High Street, Eton, Windsor - still exists as a business property. The 'Apollo Aerials' office at Chertsey train station forecourt is also still standing, and is used as the office of a car wash facility.
The phone number for Frank's Clapham office is given as MACauley 2810. Helen Mortimer (and thus Frank)'s address in season four was 24 Sussex Close, Brighton (tel: 851957). Marker's Windsor premises were found at: 93 High Street, Eton, Windsor (tel: 68319 or 67818), he lived at 3 Willow Court. The office he shared in the final season was: Ronald Gash & Associates, 22a Walton Shopping Precinct (tel: 21109). He then took over the former Apollo Aerials premises adjacent to Chertsey train station, tel: 2499, with digs in Westbury Street.