burger king , which has launched its summer menu , has branched out from run-of-the-mill sundaes by offering a pina colada smoothie , while pret a manger has gone the whole hog and started serving sit-down dinners with wine .
the british sandwich chain 's new concept is called ` good evenings ' , and runs from 6 pm until 11 pm every night , but only -lrb- for now -rrb- at its branch on the strand in london .