I hope this helps (please ignore any bad grammar I may have produced haha).
1) What is your age group?
18 to 25
2) What type of secondary school did you attend, private or public?
Private (although if your being picky in England isn't a private school and public school the same thing, technically it should be private or comprehensive right? just a suggestion).
3) At any stage in your schooling, were you taught grammar?
If I was it definitely wasn't called a 'grammar lesson' although I'm pretty sure grammar will have been involved in part of my English lessons.
4) Was grammar taught as part of your English class, or was it taught separately?
see above
5) If you were taught grammar:
a.) how was this done?
b.) did you enjoy grammar lessons, and if not, why not?
I remember not particularly enjoying English as a whole if that counts.
6) Do you think learning grammar has aided you in adult life?
Yes although thinking now a lot of my grammar was probably learnt from my mum (who is a primary teacher).
7) Do you think that grammar, in the traditional sense, should be taught in schools today?
Not on its own but integrated into other lessons.
8) In brief, please give reasons for your answer
I think this way children will learnt it without realiseing they are learning or will tire less quickly of the subject.
9) Do you think standards in English have dropped in schools?
Yes if you compare to 50 years ago!
10) Do you think that the lack of grammar being taught in schools could be the reason?
Only part of a vast number of reasons.