Tattershall Castle

In terms of floating bars, the Thames is something of a missed opportunity, but once you get your sea legs, this 1930s’ paddle steamer is a ship-shape alternative to landlubber lounges. Its all-weather decks work best on fine days when, for the price of a pint of Amstel or a bottle of Becks (all at £3.60), the historic views are at their finest; you can also sip a glass of wine or knock bag a shot of something stronger while you admire the scene. Food includes a range of mezze platters, open sandwiches, nachos, salads & mains such as Thai green curry, beef & stout pie or seafood mixed grill, with trad puds to follow. There’s a daily barbecue throughout summer, plus weekly salsa classes, a weekend disco & a comedy club for those drawn to messing about on the river.