https://www.gov.uk/hand-luggage-restrictions/baby-food-and-baby-milk
https://www.newcastleairport.com/preparing-for-travel/security-advice/
It says you can ring boots and order but you need to give a weeks notice. Might be worth a try anyway?
We found the Nuby Rapid Bottle Cooler was a lifesaver when we flew and went abroad. We just took our baby powder and asked the cabin crew for hot water. 10 minutes later we had a perfectly cooled bottle 😌
Your allowed to take baby food through security as it’s essential
It’s fine you can take it through in your hand luggage, the info is on their website