NASS has now teamed up with www.justgiving.com

Donate through Justgiving
You can use the justgiving site if you are organising a fundraising event for NASS or taking part in a sponsored event.  You can create your own fundraising page about the event you are organising.  People can sponsor you by making payments via the justgiving site which means you don’t need to use paper forms and worry about collecting cheques and cash.  Justgiving  even collect giftaid.