The Cambridge Lent, May and Town Bumps rowing races, where boats set off at regular intervals, and the object is to catch and touch (that is, 'bump') the boat in front, are held here. Anglers residing within a 15 mile radius of Cambridge city centre may fish these waters upon purchase of a special CFPAS residents permit costing 1.00 for a season. All fishing is on a catch and release basis. CLOSE. Yes you have guessed it, the catch came from the very spot where me and my Dad stood some years prior. A truly magical place on the Cam where I can see Percy fishing puffing on his cigarette with his little dog Jimmy by his side. Over 100 tonnes of digestate was pumped onto a field and flowed into the Preston Brook which flows into the River Leadon.