I believe you are right, it's just that Swindon is so close to Oxford, where I lived for a long while so it sprang immediately to mind. It's magic roundabout is famous, or is that notorious....

The design from New Jersey has also been adopted in the UK, and is known as a "Hamburger" design. It allows for the situation where there is one particularly dominant route, but in the implementations I've seen, it also has lights controlling traffic flow onto, around and through the circle. Once they get the programming right, it's very good.