Its just a database of files that you can upload onto the Tomtom software, as long as you keep the database up to date it will have all recently added speed cameras in its database..
No navigation device can detect cameras they do not have that sort of technology onboard..
Your recent buy Ian is probably a V3 so the database you are using is probably from Tomtom themselves, its ok but does miss quite a few camera's around the UK and they are not updated that often...The better Database is the pocketgpsworld one which is updated every couple of weeks and all camera sites are checked and verified before being added to those particular files and released to the general public via paid subscription around £19 per year..That includes static and mobile camera sites and the newer SPECS digital cameras that are popping up on most motorway roadworks and measure your speed over a set distance, and are a lot harder to fool..
By the way my Tomtom has the pocketgpsworld Safety camera database onboard and I have actually got mine set up to announce camera by type and the speed limit on that stretch of road..
So for instance My tomtom will actually say (Gatso Speed camera ahead, speed limit 40 mph) which impresses the hell out of people when they are in the car and they are just expecting it to just beep..