Long-haul travel with kids is madness. That, at least, is the verdict of most parents. Cornwall is popular for a reason: it is near. Singapore, at almost 7,000 miles from the UK, is perhaps one of the last places most young families would consider spending a week’s holiday. But with friends who live there insisting it was a perfect family holiday destination, I set off with my five-year-old and a spirit of defiance.