I’ve been to London a few times now, and every visit teaches me something new. Like the fact that the Tube is not your friend during rush hour (unless you enjoy being a sardine), or that Piccadilly ...

Our Frugal Travel columnist took a budget-stretching, four-day trip to one of the world’s most expensive cities. Would chasing bargains lessen, or enhance, her experience? By Elaine Glusac Photographs ...