“I’ve met a guy who I really, really like,” said Marcella*. “But how do I know if I can trust him? I don’t have a great track record with me, and I’m worried that I like him for all the wrong reasons.

Many people think ISAs are complicated, and that perception isn't helped by the maze of options out there. But ISAs are simply accounts for your savings or investments that are tax-free forever. This ...