Just started cycling and have am doing a 200 mile challenge at the end of September. I am looking for a hybrid bike that will be reasonably lighter than my mountain bike that will give me more speed on the roads, but that can also cope with a low grade of off roading and 'real' countryside. I most definitely can't afford new. May be able to scrape £100 together (i know, pitiful) Where do i even start looking? Any tips & help will be very gratefully received. I am desperate to get something better and soon as possible.