Plenty!
Yes it can rain very hard and persistently in the Lakes, but thats not actually hugely common. The typical weather is hugely changable stuff with showers coming and going at some point. Often reasonably hard but also often reasonably short.
Basically the sort of weather where one set of clothing you can wear all day unless it goes badly downhill can really help retain your sanity.....
Often entirely fine with a windshirt/non membrane soft shell though. Trousers actually slightly trickier for me outwith winter because Cioch's (otherwise genuinely excellent) trekking trousers don't have such great shower resistance.
(Not the Paramo style ones of course! Some sort of midweight nylon canvas, seemingly designed for warmish climate trekking.).
Hence me ending up wearing overtrousers more than my waterproof jacket 
Edited: 24/04/2012 at 20:06