40480 (in several variations) is one of the numbers ultimated superceded by 40698.
The complete list from my 1960 Lucas Master Catalogue 400E:
*40403A/D; 1954-56
*40480A; 1956
*40480B/E; 1957-58
*40480F; 1959
40698A; 1960
40698B; Later 1960 (NOTE: all model DM2P4; * indicates superceded)
From Lucas Popular Spares 1962-71, catalogue 725EX
40795; TR4 1962-67 (NOTE: model 25D4)
From Lucas....1963 Standard and Triumph, catalogue CCE 902/63
[for Triumph TR4 2/3-seater Sports Car]
40735A; 86mm engine (NOTE: model DM2P4)
40795A; High compression (later) (NOTE: this and following all model 25D4)
40842A; Low compression (later)
40850A; 83mm engine (special order)