Friend Kevin acquired this unit with the intent of making a TV set from it.
No can do because the CV5164 CRT requires a very high EHT, >20KV.
Google search reveals the E124 was made by Ekco Electronics Ltd and was used in the Bristol Britannia aircraft.
CV5164 = MM31-10.
https://frank.pocnet.net/sheets/129/m/MM13-10.pdf
DFWB.