"You might even enjoy it!" exclaimed Luke's Mum exasperatedly. "It might be fun!"

"I'm not going," Luke said stoutly. "And neither is Matty."

The argument was in full flow here in aisle 47 of Sainsbury's. Luke's Mum was trying to persuade him to go with my friend Matthew to an intergalactic space charity event.

"Those poor aliens who have no one to care for them!" she had said.

But Luke had put his foot down. The most exciting there was a slimy cabbage and he wouldn't know anyone. Just how do we fit in though? he thought, annoyed.