Lighting problem

Just got my 2a out after being parked up for a while. Everything worked fine but not now.
Indicators work and side lights.
Head lights don't & full beam don't work at all. The lights for the dash are permanently on even with no key in. Have to disconnect battery to turn them off. Also one rear side light is permanently on.
All bulbs are ok.
Any suggestions before I start rewiring?
The headlights are in a switch on the dash.

Cheers.

Check all of your earths!

Will do...

As old seadog says check all earths also remove every bulb, clean it and its holder then apply a bit of contact grease or vaseline and reassemble. Even if this does not fix it the bulbs will be easier to get out next time and keep there contacts a lot longer.

I will do as suggested.
Cheers