A Mechanic's Mistake

My dad was a motor mechanic and I guess the last thing he felt like doing on a day off was to maintain our family car. One day in 1947 when I was six, dad (driving), mum (beside him) and myself (in the dickey seat) were heading down a steep street towards Miranda train station when to our surprise one of our wheels sped past us, spinning and bouncing down the hill!

Dad said something I'd never heard him say before and braked, steering us into a soft muddy bank at the side of the road.
Yes, you guessed it!
In his haste to get going, dad had forgotten to secure the 4th tyre properly after swapping them around earlier that day...hence it had come loose and taken off!

No harm was done in the end and I (aged 6) thought it was all very exciting.
Here is a photo of it – our Triumph Herald ragtop. The one closest is the same model that dad kept for spare parts.