For a mid-week treat I took Betty, my mum-in-law, to Arighi Bianchi for lunch. "Drop me at the side door," she told me. "So I’ll be near the lift."

At 82 years old she’s not very mobile so I walked her into the store before going back out to park the car. Imagine my surprise when I returned to find her whizzing around 360 degrees in an expensive rotary chair.

"Yippee!" she yelled as I sprinted through the door. "Come and have a go."

I dragged her off before we were spotted and bunged her unceremoniously into the lift towards the restaurant.

"I’ll have a large white wine," she said as the waitress took our order.

By the time our lunch arrived Betty’s glass was empty.

"What a disappointment," she said raising the empty glass to her lips. "It must have evaporated."

"Here, have some of mine," I offered. "That’s awful, it tastes like water," she said sipping from my glass.

"It’s good wine, just not as sweet as yours," I lied.

After a great lunch I was determined to get her back into the car without further embarrassment.

Leaving her sat on a firm (non- spinning) chair by the disabled toilet I went to get the car.

On returning to the store I heard the piercing sound of an alarm.

Bolting through the door I found Betty shuffling towards me yelling: "Get me in the car and tell ‘em I didn’t do it."

"What the hell was all that about?" I asked, once we were on the move.

"Beats me," she said innocently. "I just pulled the light cord and the alarm went off."

Quite how my plan for a quiet lunch with an elderly lady turned into the getaway scene from Bonnie and Clyde I’m not sure.

I went to bed afraid I’d awake with a searchlight shining through the bedroom window and Paul Bianchi yelling ‘Come out with your hands up,’ from his swivel chair.