Or are scholarships not means tested? Whole different world to me, unfortunately!
It's the bursaries that are means tested. Scholarships are not means tested as they are not intended as means of financial support for those who would otherwise struggle with fees (although, from a parental pocket's point of view, they are just a discount on fees, whatever formal title is attached to them
). They are meant to be a reward/recognition for a given DC's talent/performance/academic ability; there would typically be a clause in a scholarship award letter along the lines of 'The scholarship has been awarded for the duration of the time at school, subject to DC maintaining their high level of academic achievement/continued dedication to the school's music/sports/arts activities'. In other words, there is an expectation (and quite rightly so) of a child achieving highly and 'giving' their talent and time to school in return for their scholarship, so they have to 'work for it' IYSWIM. This could mean taking part in several music competitions each year, giving regular concerts, etc, etc.
As for bursaries, the usual condition of keeping one is the level of family income from all possible sources remaining below a specified threshold and DC's decent academic performance and good behaviour. I don't know whether it is standard practice for all schools, but those I am aware of, review bursary awards for existing recipients annually so, in effect, parents have to re-apply for them every year.
Going back to the 100% scholarships, it may be that Doodles is right and two different scholarships were awarded, or perhaps that particular school has different scholarship rules from other schools. Or, it could also be that there is some third-party scholarship fund available to them which is governed by its own rules and the scholarship came from there, rather than being funded by the school. I'm thinking a foundation/benefactor of some sort funding a handful of full scholarships.
Scholarship award rules are often explained somewhere on a school's website, so you could try and have a look.