In November 2015 having arrived at Salamanca, my carbon monoxide alarm awoke me during the night. Much later in the day, I discovered the alarm had been triggered by hydrogen sulphide gas given off the faulty 12-volt onboard caravan battery. By the time I’d discovered the source of the obnoxious smell, the battery was extremely hot and probably close to exploding. There were several panic moments as a suitable spanner was found with which to loosen the bolts securing the terminals. Fitting some quick-release terminals has been on my to-do list ever since.