Many thanks LilacPoet
You are basically saying that DGS is a super-selective (unlike all the Bexley grammars), hence the sibling rule will be deemed illegal under the Admission Code 2021.
However, I am not convinced that DGS can be considered a super-selective as they don't just use merit in their selection criteria.
I give an example: in the case of DGS, for 2024 the cut-off score was 386 (Zone A) and 404 (OOC), with the 180 places allocated equally between the 2 groups. Several OOC applicants with higher scores than Zone A applicants (i.e. those with scores between 187 and 403) have missed out on a place, despite their higher merit in the Kent Test. As you know this is going to get much worse next year, as 130 places (out of 180) are now allocated to applicants from Zone A, so presumably the cut-off score difference will increase from about 20 points to perhaps 30+.
I don't see pure 'merit' being rewarded by the current admission criteria at DGS. This is very different from, for example, St Olaves / QE / Henrietta where the only criteria used is merit (all applicants are tanked by their test score and no consideration is given to any other aspects, including home address / distance from the school / catchment area).
In this context, as merit is not the only criteria used (in fact, going forward, where you live will be a lot more relevant than your score, with 130 places allocated to Zone A applicants at DGS), I believe that the School Admission Code, paragraph 1.9, does not apply here and therefore introducing a sibling priority rule would be possible / legal. In fact, it would allow families not to split their same-gender siblings, often travelling (or, worse, being driven) in different directions as they are attending different schools (sometimes in different LAs, i.e. Bexley v Kent). Surely this would be a positive for the students, their families and the schools as well.
All Bexley grammars (plus WGS, WGSG) have the sibling priority rule and, for the reasons I explained above, I believe DGS is a lot closer to these grammars (in terms of ethos / connection to the local community / selection criteria) than to St Olaves (which is a true super selective).
Would you still disagree with me and believe that the Admission Code would not allow the introduction of the sibling rule at DGS?
Thanks.