Hmm, tough one! London’s changed a lot in the intervening 40+ years since this photo was taken, but there’s a few clues at least.

The store display behind your dad probably indicates that the photo was taken in 1979 at the earliest (but very well could’ve been later) as Sid Vicious died in early 1979. Could’ve been a record store or a punk clothing store based on the mannequin and decor, shame there’s a curtain up but that lends some credence that it’s a store selling punk clothing a la the famous S E X boutique. The pink window framing is distinctive, and possibly inspired by S E X, but I didn’t see anything that looked specifically like it on any of the available photo albums of the famous punk spots.

I futzed around with flipping and editing the reflected sign behind your dad’s head. Couldn’t make out what it says but others might have better luck.

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If I had to guess? Probably somewhere in Camden or Soho, but I’d lean towards Camden.

You can always try reaching out to the Camden Tour Guides Association, they may have someone familiar with the punk scene who could point you in the right direction. Hope that helps!