I think I've found some more avatars or representations of British PMs:
- 1812 Robert Jenkinson, Earl of Liverpool: LIVERPOOL can be read on the wall in
The Blue Lotus (p.18-A2)
- 1830 Charles Grey, Earl Grey: a "GREY flannel" is mentioned in
The Broken Ear (p.4-B3)
- 1834 Sir Robert Peel: a banana PEEL features in
Cigars (p.49-B3)
- 1916 David Lloyd George: St GEORGE features in
Ottokars' Sceptre (around p.30, last panel, with a dragon)
- 1922 Andrew Bonar Law: "In the name of the LAW" is uttered in
Cigars (p.4-D3)
- 1970 Edward Heath: some HEATH (wasteland) features in
The Emerald (p.1-B2)
- 1990 John Major: one MAJOR Kardouk features in
The Calculus Affair (p.55, panel 13)
see PMs' list on
http://www.psr.keele.ac.uk/area/uk/pm.htm