I've always fancied embarking on a canal holiday - pootling along with a glass of wine in hand, watching the world drift slowly by. I've also always been fascinated by houseboats, and on trips to Amsterdam and Copenhagen I've found myself peering through portholes for a glimpse of life on the water. So, when Chris and I were offered a night's stay at The Palmer, a houseboat rental on Regent's . . .