I think I was in primary 5 or so (about age 8/9), born in 1986 so thinking it must have been about 1994/5. And every week, in the classroom, we would watch a TV show that I'm sure was BBC but easily could have been ITV (I'm in Scotland so could have been some alternative to that). It was live action, and the plot was that an alien was on earth and there was an educational element to it. I've thought about it frequently but never been able to find it despite lots of online searching. Would love to know if anyone else remembers it and could tell me what it was called!