It got good local coverage (ie North West, +other RL strongholds) as far as i know. When the story first broke it was the main sports headline on the BBC sports website, so that makes a fair impact considering the Premiership season is about to kick off.
I've had people in work who have no interest in RL asking me who this Johns bloke was, and is he that good (i likened it to Everton signing Ronaldinho on loan). So guess it's made a fair impact, i doubt it would have made the national tv news. The papers gave it a fair write up, but nothing like a back page story.
RL hasn't got a massive profile over here, which is a shame given it's probably the best spectator sport around in my opinion.