Do not buy white socks for September term,they will end up a dirty sludge colour by October no matter how much vanish you apply so just start with grey, navy, whatever ones and save your self the hassle.
Both my dds got away with knee length socks all winter last year becauses it always so hot in the classroom and they are only ever outside for 30mins max so didn't need tights
M&S print the sizes on their socks, invaluable if you have more than 1 school age dc
Put key rings on book bags so they can be spotted
Label everything in more than 1 place and make sure your dc can recognise their label
Make sure your dc can shut the lunchbox again as well as open it
Get lunchboxes with long straps so they can carry them but still have their hands free
Small uniform will sell out before the end of August
No one knows if girls have logoed polo shirts on under pinafores so get plain ones for under them (much cheaper)
Sainsburys uniform washes well but is on the short side so buy up a size
Be prepared for exhaustion to hit in the last few weeks of term
Check book bags as soon as you get in and deal with weekly letters, homework etc on the day or you will forget
If you can pay for school dinners in bulk, eg half termly so you don't forget