Giving World (helping your charity to get goods needed to the people that need them by redirecting business end-of-line, surplus and discontinued stock)
https://products.givingworld.org.uk/register/user
Localgiving
http://join.localgiving.org/BT2019

Virgin Money Giving (closing November 2021)
https://uk.virginmoneygiving.com/giving/

Just Giving
https://www.justgiving.com/

Go Fund Me
https://www.gofundme.com/

Givey
https://www.givey.com/

Wonderful.org
https://wonderful.org/

Global Living
https://www.globalgiving.org/

The Good Exchange
https://thegoodexchange.com/

CAF 
https://www.cafonline.org/charities/caf-donate