I believe I do have a timeline of events that you might find revelatory.
Russ is being harassed by a bully named Craig. When Craig hits him, Russ exclaims: “Oi! Half a glass!”
Craig then takes Russ’ guitar, but loses interest when Russ refuses to fight him for it, so he returns it.
Russ, realising he will be late home, asks Craig for 20p to call his parents. Although the sum is revised to 10p, Craig does give him the money under the instruction that he tells no-one.
Jerry becomes unexpectedly upset when he realises that they have deflated his lilo. In his shock, he shouts: “What have you done? Oh, you cockers!”
He quickly regains his composure and apologises to them all. He explains that he was keeping the lilo blown up because his wife, Hilla, had been the one who inflated it before she died.
He consoles himself and the others with hugs and his refrain of “half a glass”.
He apologises again for swearing at them. However, they are able to reassure him that his lingering aphasia has actually saved him from doing so. They comfort him by joking that “cockers” was at worst akin to “spaniels”, and agreeing that they had indeed behaved like “complete spaniels”.
Vanessa insists that Walter offers Jerry some fatherly words of wisdom. Walter tells Jerry an old trick of his – when you are feeling sad, saying “half a glass” to yourself will set your face in a natural smile.
Jerry’s ability to express himself is affected by aphasia, but he and the family choose to embrace it. Deborah reminds the audience of how well everyone did on the ‘What would Jerry say next?’ round from his 50th birthday. She jokes that Jerry has now truly turned the tables on that.
Jerry opens by saying “Gently, ladybird, here we come”. Although the speech that follows is very confused and difficult to interpret, it is warmly received by the family.
When he is finished, Jerry raises a toast “To glassware!”, which may be his attempt to say “Half a glass!”.