Pic would help, the switch/switched socket sounds like a combo e.g.
https://www.screwfix.com/p/british-g...et-white/56392
As said you need to check the consumer unit as there needs to be an oven circuit. If it's there then I would presume this leads to the switch - take the plate off the wall and see what's wired into the back of it. The fat cable to the oven sometimes is hanging out of the wall, sometimes it's just wired up to the switch or a connection plate and you add a section of cable from there yourself.