Hi Tony.
I've just checked behind the panel and there is one fuse which is okay.
I have also checked the fuses on the steering column and they are okay too.
Checking behind the gauge panel, I noticed the Infra red switch, panel light switch and test switch without wires attached.
It's a mess behind there mate, with all the additional wire work!
None of that appears to connect to the problem switch though.
The Rotary switch possibly has had some work on it as the tail and side lights work when it is set onto "T" for tail only.
As this vehicle has had trailer lights fitted and "Blues and Two's" wired in (now removed), would they have touched the hazard switch for some reason?
I'm lost.