I ate a huge breakfast and did some more of the multiple choice test. After a half-hour battling through such questions as: Which book does Sam Wetter the boot boy reside in? and Who said: 'When she appeared it was as though spring had finally arrived after a miserable winter'? I stopped and looked at Gran's note for the tenth time. It was confusing. Written in a small and shaky hand, the note consisted of a single word: REMEMBER!

'Remember what? I muttered to myself, and went for a walk.

I strolled down to the banks of the lake, taking a path through a grove of birches that grew by the water's edge. I ducked under the low branches and followed my nose towards the odd assortment of vessels that were moored next to the old Sunderland. The first was a converted naval pinnace, her decks covered in plastic and in a constant state of renovation. Beyond this was a Humber lighter, abandoned and sunk at its moorings. As I moved to walk on there was a sudden screech of demonic laughter followed by a peal of thunder and the smell of brimstone borne on a gust of icy wind. I blinked and coughed as thick green smoke momentarily enveloped me; when it had cleared I was no longer alone. Three old hags with hooked chins and mottled complexions danced and cackled in front of me, rubbing their dirty hands and dancing in the most clumsy and uncoordinated fashion. It was the worst piece of overacting I had ever seen.

'Thrice the blinded dog shall bark,' said the first witch, producing a cauldron from the air and placing it on the path in front of me.

'Thrice and once the hedge-pig ironed,' said the second, who conjured up a fire by throwing some leaves beneath the cauldron.

'Passer-by cries, 'Tis time, 'tis time!' screeched the third, tossing something into the cauldron that started to bubble ominously.

'I really don't have time for this,' I said crossly. 'Why don't you go and bother someone else?'

'Fillet of a pickled hake,' continued the second witch, 'In the cauldron broil and bake; Lie of Stig and bark of dog, Woolly hat and bowl of fog, Fadda loch and song by Bing, Wizard's leg and Spitfire's wing. For a charm of powerful trouble, Like a hell-broth boil and bubble!'

'I'm sorry to interrupt,' I said, 'but I really am very busy – and none of your prophecies have come true, apart from the citizen of Swindon bit and anyone with a telephone directory could find that out. And listen, you knew I was an apprentice so I had to be taking my jurisfiction finals sooner or later!'

They stopped cackling and looked at one another. The first witch drew a large pocket watch from the folds of her tatty cloak and looked at it carefully.