OAA have said that it won't affect your ATPL studies, apparently it's a few essays etc. The best way to get answers to question is to use the forums at
www.oxfordaviation.net or contact OAA directly, they're always happy to help.
http://www.oxfordaviation.net/docs/BCUC%20Leaflet.pdf Some more info. RE the Foundation Degree (timetable, credits info...)