Clive Wren: Hammersmith ‘On the tidal river you have the wind and the current: there are more things to think of. I’ve always tried to keep the boat in a state of readiness to go anywhere, any time, so in five to 10 minutes I can be off. I like to feel able to do that. I always like the feeling of being able to embark on a journey. And you don’t have to pack before you go. I am very fond of her, she’s taken me to lots of different places and been exposed to all sorts of hazards. It’s been a learning experience’