That would be an interesting idea, if I were a bit younger, and my husband a lot younger. Also, it would have been vastly easier for us when Eurostar left from Waterloo, but, as it is, would almost certainly entail an extra night in London, or, possibly, Paris. Then I loathe Barcelona, where I would have to stay another night, so I don’t think so. All that packing and unpacking. But I would love to cruise to Istanbul up the Bosporus.