DD is one of the youngest in the year.
Started reception in January knowing letterland letter sounds but not reading, and then picked up the jolly phonics system.
She can now read fairly fluently. Has a bit of an aversion to small print (so can pick out a fair amount of naughty little sister, but wouldn't choose to do so). She is still in the mindset that school books, she reads, all others, we do.
We did do the word box and sounds book homeworky stuff at home. Maybe once or twice a week.
And read every night the book in her bookbag.
So in the most part, I would say that she has been taught to read by the school rather than us, but we've been trying to capitalise on what the school has done.
She is not G&T. Average or slightly above within her class I would say (but is hard to tell because we rightly don't really swap notes at the playground and for reception have to take into account the sept vs jan starters and huge age disparities). Her teacher said in her reception report that they'd expect her to be working with the september starters, so would put her in the "top" 30 out of 60 pupils I suppose.
I would say though that once she got the hang of the sounding out, progression to sight reading of the common words was pretty swift, like a gear clicking into place. And we've done bog all over the summer hols, so need to knuckle under again.