If its any help - I cant remember the line but must admit I looked at the prices of the cargo route a few years ago If I remember right it was Hull to Helsinki but several stop offs on the way so the journey was quite long and the costs were much higher than travelling Newcastle to sweden (DFDS) then zipping across to Stockholm and getting the quick ferry from there to Finland or the other ferry that went all the way down to Helsinki. - Helsinki is a great city for a couple of nights though well worth a visit.
also there used to be a route from Northern Germany to Helsinki which may be of use to you if you fancy a blast through Northern Europe on route.
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