Prophecies, premonitions and predictions:

When I was 25 and worked on the railway as a fireman I had a terrible accident in which my pelvis was badly crushed by an engine. During my long convalescence I often reflected on a dream I had had six months before the event. I had dreamed of the accident before it happened- I don't know why because nothing I could have done would have prevented it happening as it did.

I've dreamed of car accidents and then witnessed them next morning. My most frightening premonition happened late at night. I dreamed that I was being strangled. I awoke screaming and unable to get my breath. To me it seemed that temperature in the bedroom had dropped to near freezing but my wife assured me that the room was quite normal. I looked at my watch it was 6.30 in the morning.

Next morning at 9 a.m. my cousin telephoned to say that my aunt had died a few hours ago at exactly 6. 30 am. It is obvious I have premonitions but for what reason do they happen when there's nothing in the world I can do to prevent them?

B T- Canton, Cardiff

I've just finished filming a new program about predictions, for London Weekend Television, that will be screened later this year. They asked my wife Jane and myself to predict the world events that will happen over the coming months. There is nothing that we can do to alter the destiny of the people whose future we've seen. But sometimes a premonition can prevent an accident- you need only read the many examples people send to this column.

Of course the conundrum is that if someone does change their plans because of a dream then the events never take place and there's no way of knowing that the dream was a premonition