You need to remember that by accepting a fixed penalty you are admitting guilt and are willing to dispose of the matter without it going to court. Because of this the prosecuting authority needs to produce no evidence against you at all, but merely needs to inform you of the facts as they see them. This information usually includes the date and time of the offence, the location and the speed alleged. This is all usually provided with the Fixed Penalty Offer.
Having said that, �Safety Camera Partnerships� (for it is they, in most areas, who issue the Fixed Penalty Notices) will usually allow you to inspect the photographs taken which substantiate the offence. This is usually by appointment at their offices. Check with their website or phone their office for details. Such an inspection will not prejudice your right to accept the fixed penalty.
Only if you decline the offer of a fixed penalty do you have an absolute right to see the photographs. If you challenge the allegation in court by pleading not guilty or by pleading guilty but disputing the speed at which you were alleged to have been travelling, the photographs would almost certainly form part of the evidence against you. They must be served upon you before the trial, otherwise they cannot be used.
As has been said, not all areas operate the Safety Awareness scheme which invites drivers to take part in a course instead of receiving penalty points. If they do they usually tell the driver of this option at the time that the fixed penalty notice is sent out.