I am not sure about charges on Windermere as they seem to be backing
down as income has dropped due to the 10 MPH.speed limit.
Have you considered Ullswater , Glenridding at the north end is 5 MI.from J.40 on M6. Parkfoot (footpath along lake shore to village)has a launch site
camping and rented acomodation.Only drawback is its like butlins,however if you just want to launch “Lake access”includes leaving car & trailer for day is £4-50.
The lake is just under 8 MI.with a dog leg in the middle. Landing at beaches and both ends is good.Glenridding is the village at the south end. Both villages have three pubs .cafe,s and shops. 20 miles from pooley Br.
along lake and over Kirkstone pass(1,500 feet) is Ferry nab launch site
on Windermere but you have to pay for both launching and leaving car and trailer.Check the cruising site for the Gathering in August You could stay B&B.and leave boat with mast up with others in the camping site.
Give me a ring if you want more detail. 01228560085