So, at 3 months, Wendy took some advice from another mother of twins and started the four B's -- bath, book, bottle and bed -- every night at the same time.

CNN: Moms with twins battle time on multiple fronts

Ms Henshaw, whose Book Barge is moored in Bath on a six-month tour, said she was doing better business on water.

BBC: 'Barge' bookshop does business in Bath as part of tour