This is the Teletextr BBC Micro demo by Bitshifters. It came 1st in the Oldschool Demo competition at the Nova 2017 party.
Credits:
- Horsenburger - Graphics
- KieranHJ - Code
More info and download on Demozoo and Pouet:
- https://demozoo.org/productions/173427
- https://www.pouet.net/prod.php?which=70465