I will hedge my bets on Extreme sports channel picking up the rights for TNA Impact as they currently have Xplosion and the Monthly PPVs so having all 3 shows on that channel would probably be a natural choice to have it all in one place. As Virgin sold it's channels to sky and will drop channels like Bravo as it.s content is similar to Sky's entertainment channels.
but for the momen it will still be on Bravo til it closes down, but as TNA has far bigger ratings than RAW and SD in the UK due to the WWE having it's content on premium sports channels so if Extreme sports gets the rights or another moderately popular channel on satellite and cable gets it you will be informed well before they move.
iF it does go to Extreme sports in the end then you will need the News sub on sky which is only £1 a month or Virgin media which you will need the L size TV package. Hope that helps.