I've been reading around the forums quite a lot and have only picked up a bit of this information. It would be *really* useful if ballpark costs could be collected in a single thread. Ranges would be great, how often the costs are incurred and links to further info.
e.g.
Mooring (North) - £x to £y, monthly
Mooring (South) - £x to £y, monthly
License (canals & rivers) - £420 to £915, annually (link)
BSS - £x to £y, ever four years (link)
Insurance - £x to £y, annually
Diesel - £x to £y, per mile
Maintenance (?? bit tricky maybe but hull blacking, repainting, engine service and any other significant items would be interesting to know)