@Chloe thank you so much, just had a look and can order the Milton bottle cleanser on boots and the tabs to collect once through security
Yes you can take anything baby stuff mine was allergic to lactose so I had to take her special milk and snacks and all the stuff for travelling just prepare a bit more time in case they want to do extra check
I'm not sure of the answer to this, would have thought the milton tablets would be OK, but not sure about washing up liquid. But, could you possibly do a boots click and collect order for once your through security if there's one in the airport? I've done this before for sun cream etc when travelling with hand luggage only and it worked well.