We were trying to persuade my mother to rent out the static caravan in her garden as an AirBnB. We took her on a bus ride to show her how this could be done: the bus itself had been converted for similar purposes.

When TPR, my mother and I all misunderstood one another over the stop at which we would disembark, I didn’t think that this would matter – until I realised that neither of them was carrying a mobile phone.