GBP in 1954, or: Why is Wolfram Alpha full of fail?

What a disappointment. I’ve been watching M for Murder with my dad and in one scene a main character reveals an attaché full of (gasp!) £500! My dad asked “I wonder how much that is worth today?”

Thinking this would finally be a problem wolfram alpha could solve, I’ve spent the last 20 minutes trying coerce the input into something it would understand, but nothing works. The closest I can get is the value of 1954 dollars today.

Can anyone figure out how to solve this with wolframalpha? Or, barring that, help me figure this out and further reinforce my opinion that wolframalpha is worse than useless?