The Fengan Chronicles — Alan Baker

The dog should never have been in the Lab in the first place. Once again, the bundle of canine energy had nosed past its owner and into the lab. In its mouth was a tennis ball that he dropped on the floor in the hope someone would play fetch with him. The ball bounced, and the dog chased it, hitting it with his paw, which caused it to bounce even more. Inevitably it bounced into the screen and disappeared with a bright sparkle and a sound later described as a fizz and plop. The dog jumped after the ball and disappeared with the same fizz and plop. Thus began the fantastic discovery of Fenga. another world reached through a wormhole. At a time when the whole world was going mad, and England and the rest of the UK was joining in the madness.