Green’s Dictionary of Slang

the ultra-conservative Morning Post newspaper (pub. in London and later amalgamated into the Daily Telegraph).

1832

Satirist (London) 26 Feb. 68/2: The Morning Post is the Opposition paper par excellence; for in good truth it is ‘in opposition’ to good sense, good feeling, genius, intellect, and every thing rational [...] This distinguished tea-pot [...] has found it fitting to attack the character of as gallant an officer as any in the British service [...] [T]his drivelling Tory Tea-pot. Tea-pot — no — Slop-Basin is the word.