We were sworn to secrecy beforehand but I've written about it since. Riley was a really nice guy but his powers of critical thinking weren't desperately impressive.
For one thing, he talked about allocating refs to games and how they tried to avoid any conflicts of interest. He tried to illustrate that using the example of Lee Mason, who had declared himself as a Bolton fan (although he was 100% a united fan). Then someone pointed out that Mason had reffed a game at Old Trafford where the rags were playing QPR (and where Mason made a shocker of a decision in awarding a penalty to united which involved both an offside and a dive). As Bolton & QPR were in a relegation battle, how could that not be a very obvious conflict of interest? You could see from Riley's expression that this had never occurred to him.
The other thing was me asking a question about the then-rule over DOCGSO, which was an automatic red card, even if it resulted in a penalty. In the OT incident I described above, QPR's Sean Derry was sent off (even though he was entirely innocent). Whether he was innocent or not, the point I made was that the penalty restored the goal-scoring opportunity whereas a red card would be appropriate if the incident occurred outside the area, such as when Ronald Koeman fouled David Platt in the 1994 World Cup qualifier. Or if the foul in the area warranted a red card in itself.
Riley replied that PGMOL had talked about that but they'd decided that if players knew they wouldn't get a red card for a foul in the area, they'd wait until the opposing player was in the box. We all laughed and he looked puzzled until it was pointed out that the ref could give a penalty if the foul was in the box.
The collective level of intelligence at PGMOL didn't strike me as being particularly high.