Letter: Send down the clones

Sir: Any engineer will tell you that it is (relatively) easy to design a product such as an aircraft or a computer program that will do what it is intended to do. It is much more difficult to ensure that it doesn't do what it is not intended to do.

By all means clone living creatures, but just because one sheep has been successfully test-flown does not mean that some future cloning experiments will not lead to catastrophic crashes.

Professor CHARLES HUGHES

Felixstowe, Suffolk