Be aware that better deals might be found elsewhere. For instance, using the DFT link, I saw the M2 MacBook Air priced at £939. However, on the Apple Education Store, the same laptop is £899 plus a £120 gift voucher. Despite trying the DFT link multiple times in various browsers, I was consistently directed to the Apple EPP Discounts For Teachers UK Store Home, but the price remained £939 without the gift card.
You might get a better offer by showing your Union card or other proof of teacher status at an Apple Store.
Always check each offer closely; it might not be as it appears.