Circle lines closed? Bollox! thats the only line I usually use in London as it requires the least amount of intelligence lol You just get on it and stay on it until you you see a stop you recognise!
Anyways, aslong as the The Jubilee Line is fine on sunday things should be no problem.
Was thinking about getting the boat, but apparently you have to sit on them and its like airline seats which is boring, as i had visions of me hanging onto the front of the boat 'Titanic' style and flying down the Thames
Andi