In reply to mattbell:
It's discouraged in Wasdale, although plenty still do it. As has been mentioned, it's all pretty public anyway, and at a weekend there will now be some overnight traffic as the 3 peaks season begins.
The YHA idea sounds good, and if wanting to be in Wasdale there's a cracking YHA there, lakeshore.
There has been a big increase in roadside / lay-by camping around here in recent years. Even during April some car parks are almost full of vans parked up for the night. Same goes for the lay-bys. I suspect if it keeps getting busier the park authorities will have a clampdown of some description.