Help for school uniform

A wish for
School uniform for my kids! £50

Needed new school uniform for my kids!

Hi I'm looking for help to get my kids some new school uniform as they've grown so quick!
Just need some grey trousers aged 9-10 for my son and school dresses' skirts for my daughter age 7-8 she's only 5 but very tall for her age! also need white polo shirts and t-shirts same ages and some trackie bottoms/t-shirt for pe!
Even if anyone has any on good condition that there kids have grown out of would be perfect!
I hate asking for help but I want my kids to go to school decent and not get bullied!
Thanks for reading!
xx