Hmm I can't imagine they'd have Will Young AND Mark Owen, the US one generally had 4 quite distinct coaches, the contestants could choose between - the budding diva young girls/big voices generally went to Christina, country to Blake, Adam didn't start off in the strongest position but eventually got some of the best in the whole contest and Cee Lo went for some of the more rocky, unique voices. Obviously it didn't always work it out like that, the coaches were interested in a variety of voices but I generally found the contestant picked the coach I expected them to.
I think Mark and Will offer the same thing to contestants as the 'male pop' on the panel. I think it would be better to have two more distinct males if possible, one pop, one in another genre or more experienced like Tom Jones/Lenny Kravitz who were mooted.