The diference from 2006 onwords that it is all on a map cd/dvd, versions before that get icons from satnav, so if u want to display a speedcam you would have to upload new icon to the satnav software cd and upload it the alternative is to for instance replace idx and url for policestations and you will get a police car icon showed when there is a speedcam around.

However this is just theoretical i have not tried it as ccfj1 says you nead to post your eng.lng file so we can take a look at it and se how it is build up