Thank you all. Basically, a certain teacher at DC's pre-school has commented on the "work I do at home with DC", with the insinuation it's all well and good but "true intelligence" lies with creativity - DC apparently likes to be told at school how to do something (e.g draw something new) and is worried about not getting it right. DC is not a natural artist, and while does draw occasionally, tend to do the same things and only recently is branching out a little.
It seems the way DC's preschool test creativity is to a large extent via drawing and play-doh (although I guess they do lots of other stuff too?). DC is not into either of these things, and is far more likely to be found making complex Lego machines (one at home recently was built alone from scratch, and had spinning rotar blades and hinged Lego technic "paddles" for it to push through the water). The other day DC was trying to replicate a pulley system for easy lifting. These things come naturally, in the sense DC hasn't been sat down and taught these things.
What the teacher does see is that I've taught DC to read and write - DC is now starting to read chapter books and reads self to sleep at night. DC spoke early and uses quite sophisticated language. The other day was saying to me when composing a story with toys -"Mummy, what's the word beginning with 'd' that means 'go away'?. I suggested 'dismiss' but that wasn't the word DC wanted. I then said "depart?" and DC said "Ah! That's the word I wanted!" and then used the word to narrate a story with toys.
I have also taught some basic numerical concepts and DC has picked up number bonds to 20 (so could answer 20-7, for example) and can also add double figures (e.g 21+21). DC sometimes asks to do sums and seems to gain pleasure from completing them.
Basically, this teacher has made me feel uncertain as to what I'm doing here. My heart tells me to carry on as I am, as DC has a huge appetite for learning and genuinely delights in knowledge.
Sorry for the long post. DC is doing fine socially, btw, and is coming up to 4 and a half.