Then, provided you have checked the power is off and are confident you can do it safely, take off the wall switch and let us see what's behind it (a big still pic will do).
I suspect a loose wire behind the switch. Might have happened when the wall was tiled (the tiling and switch look fairly new) or maybe a fixing screw for the switch has punctured a wire.
Meanwhile ask around friends and neighbours for a recommended local electrician.
p.s. what did you do immediately before that flashbang?
p.p.s.
My mistake, you said:
"Power is off
Oven/Cooker switch is set to on
Oven is off
I switch the leccy back on
Big spark from socket "
p.p.p.s.
Is there any chance the bathroom people touched the cooker circuit, e.g. to connect an electric shower?
Problem Fixed! I bought this place just over a year ago and have had nothing but problems because of the previous owners DIY attempts! Well it looks like the tw*t has tried his hand at the electrics also.
The live wire casing must have been slightly cut and a bit of the wire showing. I'm assuming when the guys have done the bathroom they have pulled on the cable slightly and this has brought the live wire close enough to the socket mounting and well the rest you know, big sparks etc! It also wasn't earthed!
Rewired, powered up, no sparks... time for some long awaited cheese on toast!
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