What Does It Take To Become A Pro Rugby Player In The UK?

I'm not entirely sure what you're asking. You want to be a pro rugby league player? The money isn't in rugby league its in playing rugby union. That's why people 'switch codes'. However most of the people that switch from League to Union are real speedsters who end up at wing and fullback positions. As for becoming pro, you'd have to move up to the highest amateur level you can. For example Super League in the United States. From there its a lot more likely that you'll be scouted by a professional team. There are also websites that act as rugby classifieds, you put in your rugby resume and it can be reviewed by teams around the world. If they're interested they'll contact you, hopefully offer you a tryout. If you're amazing they might contract you, or if they see potential they'll put you onto a developmental squad.

You need to be able to play rugby for starters Josh. ;) But seriously there tends to be two types of players in rugby. Big, strong and physical, and small quick and agile. I'd take a guess that you's be the former, so what you need to do is get your stamina up so you can play for long periods of times, and work on your upper body strength to paste those ickle quick sods.