As a parent of 2 sons who attended Crypt for 7 years and a daughter currently at Ribston, I thought I would list a few factors to consider whilst deciding which school to choose or if you are consideration entering future 11+ exams:-
Financial elements- cost of journeys to and from school, don't forget to factor in future increments
- they last for at least 5 years
- school uniforms and the extras that come with it (summer PE kits, winter PE kits, dance leotards, PE socks, PE tights, boots, gum shields, trainers etc) some schools allow you to buy generically (cheap option) other items you have to buy from the school or school uniform shops (can be expensive). Prices should be online for both.
- Crypt have a laptop scheme, where you pay monthly to buy a laptop from the school
Child and Parental time and travel commitments- after school activities include, sports matches, after school clubs, parents evening, curriculum info evening, Speech Day, Christmas Fayres, Dance/Gymnastics performances, school plays, music evenings etc. (school plays at Crypt are on Thursday, Friday and Saturday evenings and can finish late - 22.30ish)
- PTA's are always in need of support/helpers at events - ie selling refreshments at after school events, Crypt have car boot sales on Sundays, please don't leave it to others - your DC will benefit from monies raised.
- Crypt have a number of 1/2 days - how will your child get home as school buses will not run?
- Crypt have compulsory attendance at Gloucester Cathedral one evening in June (18.15-20.00hrs) for Founders Day
This is just the tip of the iceberg

there are many other organised events which vary in frequency and cost from school to school - DofE Award, residentials, non-uniform/cake sale days, photographs, Olympiad challenges, ski trips, netball trips, school trips, enrichment week, field trips etc.
If any parent from other schools have "hidden" extras at their school, please feel free to add to the list.