I am looking for a generation ships story (full novel) published some time in the 1960s. The plot goes like this: a selection of people decide to construct a generation ship. I don't think there was any conflict/disaster involved). They take the names of famous scientists. After the journey begins, they gradually lose any knowledge of their parent culture and consider the ship to be the universe. An inquisitive person discovers unused airlocks and then a previously unknown part of the ship. This transpires to be the pilot's cockpit. The ship eventually automatically lands on a planet and the passengers are warned off using the ship by a warning of poison gas, in an effort to get them to colonise the new world. This book turned me on to SF and I would dearly like to find it again. If I remember correctly, a UK TV film was made of it.
Thanks in advance for any help.
Thanks in advance for any help.