I think it was the wolf enclosure, along the north south path in the NE part of Regent's Park.

The Zoo has been rejigged since then, I attended the Danish Summer Fair just nearby every year, and used to pop out to say Hi to the wolves ('Hi hi ulve!') but they're now deeper in the zoo.

The Tigers are along by the Gibbons and the camels, on the boundary of the East - West path. Occasionally walking across Regent's Park you'll hear a loud roar.

I guess the US Ambassador who's residence is next door hears that a fair bit.

Back on topic.

Uncle Monty with his potted vegetables was bonkers. 'Flowers are tarts!'