“I didn’t mean the queen, necessarily,” retorts Mum. “But some of those others. Princess Michael of Kent, for example. She could travel by tube, every so often, couldn’t she? These people need to learn about real life.”

The last time my mum traveled on the tube was about 1983.

“Shall I make some coffee?” I say brightly.

“If you ask me, this gridlock business is utter nonsense,” says my dad. He jumps down from the stepladder and brushes the dirt off his hands. “It’s all propaganda.”

“Propaganda?” exclaims my mum in outrage.

“Right,” I say hurriedly. “Well, I’ll go and put the kettle on.”

I walk back into the house, flick the kettle on in the kitchen, and sit down at the table in a nice patch of sunshine. I’ve already forgotten what my mum and dad are arguing about. They’ll just go round and round in circles and agree it’s all the fault of Tony Blair. Anyway, I’ve got more important things to think about. I’m trying to figure out exactly how much I should give to Philip, my boss, after I win the lottery. I can’t leave him out, of course — but is cash a bit tacky? Would a present be better? Really nice cufflinks, perhaps. Or one of those picnic hampers with all the plates inside. (Clare Edwards, obviously, will get nothing.)

Sitting alone in the sunny kitchen, I feel as though I have a little glowing secret inside me. I’m going to win the lottery. Tonight, my life is going to change. God, I can’t wait. Ten million pounds. Just think, tomorrow I’ll be able to buy anything I want. Anything!

The newspaper’s open in front of me at the property section and I carelessly pick it up to peruse expensive houses. Where shall I live? Chelsea? Notting Hill? Mayfair? Belgravia, I read. Magnificent seven-bedroom detached house with staff annex and mature garden. Well, that sounds all right. I could cope with seven bedrooms in Belgravia. My eye flicks complacently down to the price and stops still with shock. Six point five million pounds. That’s how much they’re asking. Six and a half million.

I feel stunned and slightly angry. Are they serious? I haven’t got anything like £6.5 million. I’ve only got about. . 4 million left. Or was it 5? I stare at the page, feeling cheated. Lottery winners are supposed to be able to buy anything they want — but already I’m feeling poor and inadequate.

I shove the paper aside and reach for a freebie brochure full of gorgeous white duvet covers at £100 each. That’s more like it. When I’ve won the lottery I’ll only ever have crisp white duvet covers, I decide. And I’ll have a white cast-iron bed and painted wooden shutters and a fluffy white dressing gown. .

“So, how’s the world of finance?” Mum’s voice interrupts me and I look up. She’s bustling into the kitchen, still holding her Past Times catalogue. “Have you made the coffee? Chop chop, darling!”

“I was going to,” I say, and make a half move from my chair. But, as always, Mum’s there before me. She reaches for a ceramic storage jar I’ve never seen before and spoons coffee into a new gold cafétière.

Mum’s terrible. She’s always buying new stuff for the kitchen — and she just gives the old stuff to charity shops. New kettles, new toasters. . We’ve already had three new rubbish bins this year — dark green, then chrome, and now yellow translucent plastic. I mean, what a waste of money.

“That’s a nice skirt!” she says, looking at me as though for the first time. “Where’s that from?”

“DKNY,” I mumble back.

“Very pretty,” she says. “Was it expensive?”

“Not really,” I say. “About fifty quid.”

This is not strictly true. It was nearer 150. But there’s no point telling Mum how much things really cost, because she’d have a coronary. Or, in fact, she’d tell my dad first — and then they’d both have coronaries, and I’d be an orphan.

So what I do is work in two systems simultaneously. Real prices and Mum prices. It’s a bit like when everything in the shop is 20 percent off, and you walk around mentally reducing everything. After a while, you get quite practiced.

The only difference is, I operate a sliding-scale system, a bit like income tax. It starts off at 20 percent (if it really cost £20, I say it cost £16) and rises up to. . well, to 90 percent if necessary. I once bought a pair of boots that cost £200, and I told Mum they were £20 in the sale. And she believed me.

“So, are you looking for a flat?” she says, glancing over my shoulder at the property pages.

“No,” I say sulkily, and flick over a page of my brochure. My parents are always on at me to buy a flat. Do they know how much flats cost?