This rhyming slang interpretation is surely discounted by the facts that:

the potman has already given the alarm of fire;

Brown has already suggested the advantage to be taken of the situation;

and has forbidden the admittance of the firemen (whose object appears to be to share in the "Booze, booze" rather than to put out the fire) till it was "all mopped up":

and only then did somebody shout "MacIntyre" ~~ a bit late by that time to purport to raise the alarm, eh?