@NameChange30 umm, well from my experience of food poisoning I learnt that it doesn't often cause sickness... more diarrhoea  so perhaps you're right and it's a stomach bug.
@purpleviolet1 it is amazing, but we had to remove a mobile that was hanging over his cot as it was quite a low one and he could reach up and grab the toys, his idea was to grab one and viciously shake until all the others had fallen off! I was worried the whole thing might fall down on him!
He does the same thing on his playmat. I put him in one place and if I leave the room for anything then by the time I come back he's turned himself round or has manoeuvred himself half off it and onto the floor!
DS was too tired this evening to eat his peas, he messed up his naps a bit this morning and that threw him off for the rest of the day. Tomorrow is swimming and a church group so fingers crossed we can still get the naps in!