‘What do you mean it tried to eat you?’ I ask.

‘Matt’s gone potty,’ says Abbey.

‘No, I haven’t, Abbey,’ yelps Matt, hopping up and down. ‘And that’s the problem! No potty!’ He turns to Nan. ‘Can I use the portaloo out the back? I’m capital D Desperate. Please?’

‘Sorry, darl. You know the rules,’ says Nan.

For as long as we can remember, Nan has had a brand-new portaloo in her back garden.

That’s weird enough.

What is weirder is she has never let anyone use it.

Or even go near it.

She has a cross-stitch sign above her mantlepiece that reads:

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‘Nan!’ says Matt, ‘the indoor dunny tried to nom nom my bummy.’

Nan gets up to investigate and we follow.

Outside of a plumbing convention, it is a very strange thing to be standing in a group staring at a toilet.

However, this loo is glowing an eerie green, so we can’t help but stare.

‘Be careful, Rich,’ says Matt. ‘That thing is totally loo-co!’

‘What is going on here could probably explained by science,’ I say, expertly.

‘You think?’ says Abbey, rolling her eyes.

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Nan’s happy-go-lucky vibe has evaporated like a pool of Superfizz on a sunny day. It’s strange, she never takes anything too seriously, but this science-fiction toilet situation has got her frowning like a blobfish at a maths exam.

‘What is . . .’ I say.

‘. . . going on?’ says Abbey.

Nan sighs. ‘Abbey, dear, cancel my tattoo appointment and pack my unmentionables. Nan’s gotta go –’

‘But I need to go!’ says Matt, dancing on tippy toes.

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Matt bolts to the back door. ‘Sorry, Nan, I’m using the portaloo!’

‘No, Matt! Stop him, Rich!’ yells Nan.

I sprint out after Matt but trip on one of Nan’s rude garden gnomes.

Then everything goes into slow motion . . .

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As we fly into the portaloo, I see:

1. A roll of toilet paper

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2. A soap dispenser with no soap in it

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3. A slightly too small basin to ALMOST wash your hands in

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4. A mirror over the slightly too small basin

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5. A big red button marked F.L.U.S.H.

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6. But no toilet!

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Matt and I slam face-first into the mirror. It makes the sound of a pair of wet footy socks being slapped on a table.

The door goes . . .

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Then something says . . .