A pedantic point (but possibly relevant here):
Officially a degree isn't a 'qualification' at all. The awarding of a degree is entry into a class of membership of a university. So, for example, the 'Members' of the University of Sheffield aren't either its staff or its undergraduates but its alumni. (Postgraduate students and staff are only Members of a university if they hold a degree from that university).
(Some religious sects insist that their members may not hold membership of any other organisation, which results in occasional requests from university graduates for their degrees to be withdrawn by their Alma Maters).
Each university retains the freedom to determine the criteria for entry into Membership of that university, which is why they're allowed to award honorary degrees to people who've never even studied there. It further explains why Oxford and Cambridge are allowed to permit holders of first degrees to move up from 'Bachelor' to 'Master' (which are simply different classes of membership) upon payment of a nominal fee.
So, if Cambridge chooses to offer 'Membership' to anyone who holds a 25 metre swimming certificate (awarded by them), that certificate automatically becomes a 'degree'!
Chris
(Member of the University of Sheffield, despite being unable to swim 25 metres!)