IF THERE AINT NO FLASH THERE AINT NO GOD DAMN FINE!!!
Not all cameras flash - the Tuvelo systems use IR light and can capture an image day or night without flash.
If a traffic light camera did capture you then you should hear about it very quickly. The police/council has to issue a Notice of Intended Prosecution within 14 days of the offence, to establish who was driving the vehicle at the time. If they miss that deadline then you can't be prosecuted, so if you've not heard anything within a fortnight you're in the clear.