Chockabloke introduces both himself and Chock-A-Block - the sophisticated computer that he feeds blocks of data. Included on the blocks this week are a rhyming game and a song about a grandfather clock.
Chockagirl introduces herself as she takes her turn to place data blocks into Chock-A-Block. Chock-A-Block presents not only songs and the rhyming game of "Rockablock", but also produces a new friend: Joe Crow.
Chockabloke is convinced that he's a victim of "trickabloke", as a mischievous Chock-A-Block keeps randomly playing images and sounds of sheep. There's also the tale of insomniac Farmer Jake and his sheep counting to help him sleep.
Chockabloke has a somewhat clumsy time as he nearly drops a block on the floor and then struggles to control the Rockablock rollers. Having a much more successful day is Tom the Piper, who controls the sun and the moon.
Chock-A-Block gets a fly stuck inside its workings, while Chockagirl sings the song of a shy magpie. This edition doesn't exist in the BBC archives, but a domestic copy was revealed to exist in February 2024.
There's a touch of freshness in this edition, as Chockabloke not only backs in with the Chockatruck for the first time, but also introduces a mole that raps to Old King Cole.
Chockagirl has to erase some of Chock-A-Block's blocks, as the machine has been filled with noises. There's also the song of The Rhyming Cat, forced to do only things that sound alike.
Chockabloke has a feeling it's "going to be one of those days" as the Block Stock is jumbled up, and Chock-A-Block has been crammed full of silk, blocking his slot. That's to say nothing of the cake-obsessed snake in the studio.