Renting out a room - how much b4 I pay tax? 
  Completely non-bike related-ish, but were I to rent out a room in my home, how much can I make before I have to pay tax on it's income?
 I quite fancy another sports bike, so the best time to buy would be late Jan - Feb, so if I can make some £ between now and then....!
 
 Thanks
 
 Tim