The blame seems to rest with your father.

On the surface, the film is a globe-trotting gross-out caper in which Nobby, who's from a hellish version of the titular Lincolnshire town (twinned with Chernobyl), is reunited with his long-lost brother Sebastian (Mark Strong), who has become a spy for the British secret services. That makes him a servant of the powers-that-be that have no time for Nobby and his scrounging ilk.

a.d. 978. — In this year was held the celebrated gemot at Calne in Wiltshire, when the floor gave way […]

Unlike the divine gift, the gift of blood can be corrupted by the giver as well as by the givee.