free spirit
more tea vicar?
the earth's not the fault, though the fact you're asking that question makes me think that you could be right about calling the landlord to sort it out...
if you're wanting to sort it yourself though, then the next step seeing as there's nothing obvious in the ceiling rose would be to switch the power off at the main fuseboard (if in doubt about which circuit to switch off, just use the main switch for the entire house), then unscrew the light switch from the wall and see if any of the wires have come loose from the switch. If one of the wires in the switch is obviously loose / disconnected, then reconnect it (if you feel competent to do this), switch the power back on and your light should be sorted.
if you can't see anything obvious in the light switch, then I'd say give it up and call the landlord.
wiring diagrams for lightswitches can be found on the web, or you can check what should be wired where by unscrewing an identical lightswitch elsewhere in the house and copying how that's wired, but be warned that there are several different ways to wire up lights in a house, and there may be several wires coming into the switch as they can be wired so the wire for the next light in the circuit comes terminates in that switch as well... or it could be dead simple and you'd just have the live wire from the main lighting circuit, and the switched live wire going from the switch to the light... both of which would usually be red (or brown in old circuits).
best to ring a sparky if you're not confident in what you're doing, but no real harm IMO in having a quick look behind the switch to see if it's something really obvious and easy to fix. (with the power off)
