Well, the common spelling in the US is apologize. However, I think even if you had Apologize.TV it would be a hard sell. IMHO it doesn't really fit the .tv extension, and there are still loads of dictionary word TV names left. Also, for the keyword "Apologise" there are only a few searches a day for it, and there are no paying advertisers for PPC from what I can see. If you have just registered it, I would suggest probably getting a refund because of the high renewal fees. Not being negative, just giving you my honest opinion.