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Ah...sorry...I get the joke here !
Actually, the large actor chap who was in the office I did recognise, although only afterwards when I watched an episode on DVD. He was actually very funny, especially the bit where he was being given his annual appraisment by Ricky Gervias. It brought back many memories of when I worked for BT and we had to go through similar nonsense every 2 years. Wished I had been able to stonewall as good as this actor though...I think I would have had more fun !