It's on the Transmission website.
"DONATE
Can’t make the event?
100% of donations on this page will be split 50/50 between Not A Phase (charity no. 1193381) and Good Law Project (non-profit company no. 10556197) who provide incredible support to the community 365 days a year.
£10 £20 £30 £40 Custom Amount"
Then a choice of
"One-Time Donation
Weekly Donation
Monthly Donation
Quarterly Donation
Annual Donation"
So if you choose £10 it then says
"Support us by covering the fees we have to pay
3% Cover the Fee £0.30 Total£10.30"
https://www.transmissionlive.uk/