‘You need some help getting it off?’ she tries again. ‘Some of our customers find it tricky the first time.’

I have a hideous vision of me gripping on to the counter and Mindy trying to haul the all-in-one off me while we both pant and sweat with the effort and Mindy secretly thinks, ‘I knew all British girls were heifers.’

No way. Not in a million years. There’s only one solution left. I’ll have to buy it. Whatever it costs.

I give an almighty wrench and manage to snap two of the straps up on to my shoulders. That’s better. I look like a chicken trussed up in black Lycra, but at least I can move my arms. As soon as I get back to the hotel room I’ll cut the whole thing off myself with a pair of nail scissors, and dispose of the remains in a public bin so Luke doesn’t find them and say What’s this? or, You mean you bought it even though you knew it didn’t fit? or something else really annoying.

Luke is the reason I’m standing in a sports apparel shop in LA. We’re moving out to Los Angeles as soon as possible because of his work, and we’re here on an urgent house-hunting trip. That’s our focus: real estate. Houses. Gardens. Rental agreements. Very much so. I’ve only popped to Rodeo Drive very, very quickly between house appointments.

Well, OK. The truth is, I cancelled a house appointment to come to Rodeo Drive. But I had to. I have a genuine reason for needing to buy some emergency running clothes, which is that I’m running in a race tomorrow. A real race! Me!

I reach for my clothes, grab my bag, and walk stiffly out of the cubicle, to see Mindy hovering nearby.

‘Wow!’ Her voice is bright but her eyes are shocked. ‘You look …’ She coughs. ‘Awesome. It’s not too … tight?’

‘No, it’s perfect,’ I say, attempting a carefree smile. ‘I’ll take it.’

‘Great!’ She can barely hide her astonishment. ‘So, if you want to take it off, I’ll scan it for you …’

‘Actually, I’ll wear it.’ I try to sound casual. ‘Might as well. Can you put my clothes in a bag?’

‘Right,’ says Mindy. There’s quite a long pause. ‘You’re sure you don’t want to try the size 6?’

‘No! Size 4 is perfect! Really comfy!’

‘OK,’ says Mindy after a silence. ‘Of course. That’ll be eighty-three dollars.’ She scans the barcode on the tag hanging from my neck and I reach for my credit card. ‘So, you’re into athletics?’

‘Actually, I’m running in the Ten Miler tomorrow afternoon.’

‘No way!’ She looks up, impressed, and I try to appear nonchalant and modest. The Ten Miler isn’t just any old running race. It’s the race. It’s held every year in LA and loads of high-profile celebrities run it and they even cover it on E! And I’m in it!

‘How did you get a place?’ Mindy says enviously. ‘I’ve applied for that race, like, every year.’