Billericay Dickie has a rhyming sequence which is very unusual

I bought a lot of brandy
When I was courting Sandy
Took eight to make her randy
And all I had was shandy
Another thing with Sandy
What often came in handy
Was passing her a 'Mandy'
She didn't half go bandy

My first reaction was has he been reading Rupert Bear, however the song works despite using the same rhymes for the whole verse