I would like to applaud the statement that 'not every intelligent child is the same.'
Dd is very intelligent - streets ahead of where she 'should' be in terms of literacy, her writing is amazing (her teacher's words) - she is Y2. Reading-wise she is reading Noel Streatfeild, and other longer novels.
She to my knowledge is not on any G&T list (don't even know if they exist), but given that at parents' evening the teacher described maths as being her weakest area, as she was 'comfortably near the top of the top group' rather than being light years ahead as she is in literacy, I am guessing that a G&T list doesn't exist.
She is also an August birthday and the youngest in the class, and I think it is essential that she remains with the class and her peers, for emotional reasons.
In terms of literacy, it is very easy to provide extension work - and in fact dd does this herself - her writing is always extended, and she motivates herself to do 'extra' writing at home - she will often write poems in her bedroom, and bring them down as a finished article, with zero parental input from us. She stretches her own writing by constantly expanding vocab and punctuation etc that she is picking up from her reading.
The point is, I'm unaware that the school is either 'leaving her to be bored' or 'accelerating her learning' - she is doing that herself, and I just can't imagine that changing, as she is incredibly self-motivated, and that brings its own reward. The reading books she brings home from school are appropriate in level, and the writing she produces is stunning - what more should they do? I'm happy and she is!
So, I would be careful of saying 'every bright child WILL be bored' - so far the evidence suggests not.