Is savoo.co.uk Safe?

Great way to raise money for charity. Every (legitimate) search raises a penny (UK) to whatever charity you have active. The Savoo Search Engine is accredited by the Institute of Fundraising. In addition, The Fox Project (the charity that I am currently supporting via Savoo) lists "Savoo Search Engine" as a way to help them raise money. TLDR: Everything seems to point to Savoo being a legitimate way to raise money for charity at no monetary cost to its users.