‘to be unable to run a whelk stall’ and variants: to be incapable of managing the simplest task or enterprise—coined by John Elliot Burns (1858-1943), English trade unionist and politician, in the 1894 New Year’s address to his constituents of Battersea
1808, as ‘to talk a horse’s hind leg off’—‘[animal’s] hind leg off’ is probably a hyperbolic extension of ‘to talk’, emphasising the speaker’s persistence or eloquence
British, 1925—‘to throw a spanner in(to) the works’: to cause disruption, to interfere with the smooth running of something—synonym (American English): ‘to throw a monkey wrench into’
‘lion’: a person of note or celebrity who is much sought after—from ‘lions’: things of note, celebrity, or curiosity in a town, etc.—from the practice of taking visitors to see the lions which used to be kept in the Tower of London
‘hell in a handbasket’ (1841), ‘heaven in a handbasket’ (1834) in Irish contexts—‘handbasket’ chosen for alliteration with ‘hell’—‘to go to hell in a handbasket’ meant ‘to go to hell’—‘to go to heaven in a handbasket’ meant ‘to go to heaven’ or ‘to go to hell’
meaning: ‘thoroughly dejected or disappointed’—appeared (1973) in Tyne and Wear (north-eastern England)—originated apparently in football parlance, in which it soon became a cliché
UK, 1857—characterised by savage violence or merciless competition—from Alfred Tennyson’s poem ‘In Memoriam’ (1850), in which ‘red in tooth and claw’ refers to Nature’s brutality
UK, 1835—mischievous or deceitful behaviour—alludes to the proverbial playfulness of monkeys—probably modelled on Bengali ‘bãdrāmi’; cf. modern Sanskrit ‘vānara-karman’, from ‘vānara’ (monkey) and ‘karman’ (action, work, employment)
‘the milk in the coconut’: a puzzling fact or circumstance; alludes to the question of how the milk got into the coconut—of British-English origin (1832), not of American-English origin as stated by the Oxford English Dictionary
originally: a child wearing the house key tied around their neck and staying in the streets while their mother is at work—USA, 1935: a poor Afro-American woman’s child—USA & UK, WWII: a child whose mother was engaged in war industry