Claire is my half person.
When we were both students, we were (of course) council tax exempt. If we were both non-students, we’d be a two-person household, and we’d pay full tax. But because we’re one student and one non-student, you’d think the non-student (the taxpayer) would get a 50% discount, but instead they get a 25% discount. The “half-person” extra tax they pay is presumabley to pay for the many advantages that come from living with a student(?), or something.