DFID's response:

A Dfid spokesman said the department was one of several which part-funded the Pope's visit.

He added: "Our contribution recognised the Catholic Church's role as a major provider of health and education services in developing countries.

"This money does not constitute official development assistance and is therefore additional to the coalition government's historic commitment to meet the 0.7% UN aid target from 2013.

See here.

I haven't come across this wonderful thread before. It is interesting that there don't appear to have been any contributions from Roman Catholics. So here is a belated offering from one.