What British Airways' club suite actually costs vs. premium economy on the same transatlantic route

Here's how much it costs to fly in Business Class on British Airways versus Premium Economy.

I flew on a British Airways A380 in economy and premium economy. Upgrading isn't really worth it.

Touches of luxury in British AIrways' World Traveller Plus didn't feel like a huge upgrade as the A380 upper deck has plenty of space even in economy.