This is purely anecdotal but I would be interested in your thoughts.
My attendance at school was always patchy and I didn't really go in at all, much, in my GCSE years. However, I got A*s in my English and I'm fairly sure it's purely down to a love of reading.
I don't remember anybody ever teaching me about language, punctuation or grammar - I just picked it up. My dad had taught me to read by the time I started school.
I am just wondering if this is the exception or whether English, or rather writing and reading skills can be taught just by seeing models through reading? (I am not including English taught as a foreign language.) :)