Westwood 2012H won't start?

My Westwood 2012H cut out completely when I switched on the lights, and wouldn't start, or show any sign of life. I checked the fuses, all seem fine. I've isolated the light switch generally cleaned things. There is now a click when I turn the ignition key, but nothing else; no dashboard lights, no start. The click in not coming from the starter motor. The battery seems OK. Does anybody have any suggestions please.