Hi all!
On TV4.se’s WebbTV, there’s an interview with Benny and Björn (of ABBA fame) and I’m sure there’s a photo of Per on the wall behind the interviewer.

To watch, you’ll need to log in (or sign up - I did so for Marie’s documentary; never thought I’d use it again but I’m often watching programmes online)
http://webbtv.tv4.se/webtv/main.do?treeId=10039&&progId=7952

Look behind Lasse (the interviewer) when he starts talking to Benny and Björn inside Cirkus, Stockholm.

If anyone can be bothered to watch and confirm whether it is Per, I’d be most interested to know :-)