I think they were having a laugh. Just as Michael turned up with his ball-belt, Ross had his 1970s cardigan and tray of Pimms and Carr has made jokes about how he looks like an odd Federer. It might have been a deliberate wind-up for Andy, or didn't give any real thought to anyone thinking it a serious insult, as they are both on record saying very positive things about Andy.
Or maybe that's what they always wear to play tennis, in which case - fine!
If I were to criticise, it might be Branson turning up in his Virgin Active gear, but then that probably is what he always wears to play tennis and he is a big tennis fan, so he'd have been keen to play, regardless of plugging opportunities.
I did like how MacIntyre had his Nike head-band on upside down, and he is so obviously a massive tennis fan and his humour is perfect for this sort of event. I suspect he watches a lot of the Legends exhibition stuff, but all of them were brilliant in their own way and brought something to the event.
One thing I did notice, was that the event was being called Rally Against Cancer 2013, which makes me hopeful there will be more next year.
For me BoJo was the star turn. From his scruffy get-up to his ancient tennis racket with the warp factor, he was brilliant. Don't share his politics, but I can recognise a genius with the common touch.