Thanks Etienna for the quick response.
I've gone through this whole appeals Q&A page many times the whole night
, unfortunately couldn't find information of Langley Grammer School.
I live in Local Addmission Area of LGS and I'm quite confident of making case on capability front and also hopeful (fingers crossed) having backing/support of HT (not discussed or talked yet though).
Appreciate if someone can share their experience of appeal in such a narrow miss situation at Langley Grammer School specifically, and other slough Grammer schools generally please.