Just thought I'd answer incase anyone else was looking for the answer to the same question!
Paed firstly wanted a list of things we were concerned about, and we went through family history. She got him drawing a few simple pictures (circle, cross, square, Daddy), then she asked him to kick a ball.
She did strip him down naked, listened to his chest (he has a slight cough left over from a recent virus, so don't know if that's 'standard'!), she weighed him, we got him dressed and she admitted she'd forgotten to measure him.
We went through a form to measure his strengths and weaknesses. She said she'd forward a copy of the same form to his nursery for them to fill in aswell.
She has referred him to Audiology and we've to take him to the opticians, just to rule out any problems, and she's referred to what she called 'The Team' - OT and Psychologist, also said once he's seen the SALT that he has already been referred to, the chances are that SALT will want a referral to a specialist SALT, and the specialist SALT will then form part of 'The Team'. Keeping up?!
That was about it really. Luckily DS2 was in a fairly easy going state and didn't mind too much, though I'd taken two pocket fulls of Thomas the Tank trains with us, so that might have helped?! DS3 on the other hand, well, I think the Paed scowled at him - twice! 
