Writing this in the hope that it is useful to people either this year or in future years.
We based our decisions about which schools to apply to at 11+, like many people on tight budgets, on affordability. A key consideration was the scholarships available. DC excels in an area where scholarships are often awarded. We targeted most of our efforts on 2 schools where we could afford it if the advertised scholarship was awarded. DC was offered a place and the "maximum" % scholarship in both schools.
But in school A the scholarship remittance is stated as a fixed number, no longer a % of fees. So as fees go up and e.g. VAT gets added to school fees, the scholarship remittance stays fixed and the percentage remittance gradually erodes over the 7 year period.
In school B the % has been very significantly reduced from what was (and is still) advertised as available on the school website. (the offer letter makes it clear the scholarship is the max available, so it's not a case of a school advertising scholarships of "up to X%" but this particular scholarship being Y% where Y<X ).
These are basically two variants of a bait and switch scheme, which "occurs when a prospective buyer is enticed by an advertised deal that seems attractive but the advertised deal does not exist or is inferior in terms of quality or specifications. The practice is considered unethical."
So, despite being awarded the maximum scholarship at the schools we thought we could afford (based on what they advertised) , school B is now unaffordable and school A would initially be just about affordable, but will quickly become unaffordable e.g. if VAT is added. As a colleague whose daughter had been offered a couple of scholarships several years ago put it : "great - they've given us half a bus ticket, but we still can't ride the bus".
In short: don't assume the generous percentages currently on a school website will actually be awarded, even to an exceptional candidate. Do assume that, averaged over the 7 years, you'll be paying the vast majority of full fees, and with VAT on school fees looking likely it's safest to assume that even with a scholarship, you'll be paying equivalent of current full fees.