Hi - Welcome to the forum.
Windermere fishing is pretty poor if you want to catch - but has lots of boats if you want to major on the first part of your mission.
Coniston - you can hire rowing boats and electric launches- Not far from where you are staying.
Ullswater - fishing has kind of died off now - boats are available.
No additional licence required for the above three.
If you want a fishery with boats try Esthwaite.
http://www.hawksheadtrout.com
Esthwaite is not far from where you are heading.
Derwentwater has boats too.
Esthwaite is the only one that you will have to pay for the fishing.
Also look at
http://www.lakedistrictfishing.net
Another useful resource for the weather is
http://www.lake-district.gov.uk/weat...home/index.php
If you store the number in your mobile - you can dial up to hear it read out - It's local and updated twice a day.
Best Regards
SAB