You could always ask Chris at Debbage Yachting Just outside the lock gate at the head of the Orwell. Not the prettiest place to be but not the most expensive either.
-------------------- "I'm on a whisky diet, i've lost three days already"
"I went to buy some camouflage trousers the other day but I couldn't find any"
"I bought some HP sauce the other day. It's costing me 6p a month for the next 2 years"
Tommy Cooper