You need a warning on that link to say that he starts talking out of your speakers when you click on it.  He seems to be using his "serious" voice mode - it reminds me of his "Diana's death" voice mode, minus the fake stuttering.

Well spotted - it's a "think-tank", which is usually code for a political propaganda machine...

https://en.wikipedia.org/wiki/Open_Europe

Since Mandelson attacked Open Europe in 2005, in 2012 he presented it with the "International Think Tank of the Year Award" at the Prospect 2012 Think Tank Awards

It seems they were anti-further EU integration, now they're against us leaving the EU.  Presumably they want the comfortable middle ground, where they get to pop along to the odd meeting and get wads of expenses.