Ferry on the Mersey

Notice carefully the preposition here - it's a ferry on the Mersey, not across it (as in the song). I've been in Liverpool three days now, each day more overcast than the other (or if the sun comes out it does so while I'm in talks at the conference). It's hard finding time to dedicate to blipping, what with all the work and social pressures, so this will have to do for today.