If you've read google results about people using a plug, then that only applies if the mains is purely for the fan (on a fan assisted gas oven), or just for the ignition of a gas oven.
If it's a full electric cooker then it needs doing properly. You said there's a red switch on the wall higher up, which would tell me that there is a high current cooker connection there usually. Does the switch turn on the plug socket below? (try it using a table lamp or your miscrowave). If it does then it's most likely not what you need. If the switch DOESN'T turn the plug hole on / off then I'd say there's a hidden connection point somewhere close to that socket.
Does the cooker already have a heavy duty type of mains cable attached? If it does I'd be happy to drop by and assess the situation for you - if you have a cooker connection hiding there I can safely wire it in for you (for a small fee)
If there's no cable attached to the cooker at all, and/or there's no connection present then it's a job for the professionals.
Before anyone tries to tell me off, you do not need to be a qualified electrician to wire in a cooker to an existing cooker point, just be competent to do so. Only wiring prior to the consumer unit requires a qualified person.
(If I'm incorrect do tell me)