Honestly as an older person (I assume ) it surprised me how few folks know it. Untill I considered the diff in our age groups.

As a child in Oxfordshire I saw them a few times when cycling around the villages, But as a child of the 70s. Cycling miles with little or no parental knowledge of my location. Was not only common for me. But for all folks my age,

Younger folks tend not to have that level of freedom now. And as they age. No time to waste.

Wallabies were rare enough to be fascinating when we spotted them. But not unexpected when seen.

I was about 7 the first time I saw them in the Burford area. And only remember a few occasions after that. So far from common. But we knew they were considered a settled UK species. Much like gray squirrels but less successful.