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Let's just say I'm full of surprises. DTC. I've never regarded finding humour in the ludicrous to be beneath my intellectual prowess. Quite the opposite. I do it every day on here - particularly with those so obviously trying hard to impress. ;o)
The lettuce is a reference to a tabloid's experiment to determine whether Liz Truss's term as PM would outlast the life of a lettuce. In this case Matt Hancock is camp leader and 'Spud', now with comical human features and dressed in his finest, is the lettuce.