A Life For Infinite Enjoyment

Is this the real life, or is it just fantasy?
Freddie Ryan Emlyn Davis is just your average self afflicted loser bumbling his way through 1986 since his messy divorce, until he is shot and left for dead at an ATM.
He wakes up in the hospital of a secret organisation under the North Sea only to be told that he is the direct descendent of the magician Merlin; and using powers he did not know he had and has no idea how to use, he must overwhelm a powerfully evil witch from a different dimension bent on plunging the world into abject misery.
A message encrypted with The Mercury Code leads him and his friends to the final combat to decide the fate of the Earth at a Queen concert at Wembley Stadium.
Freddie has to beat the Witch - but he only has a feather duster; and the most evil entity in the Universe is his ex-wife.