I'd be wanting a electric fan oven and a gas hob.
We had an electric oven running off a standard plug for 10 years+. I think it only went up to 230C and was a bit ****, but it worked. It was fitted like that by the people who we bought the house from, even though they had an oven outlet wired in at the same time, which was a bit bonkers, but there you go. When I replaced the oven I put the new (double) oven on the oven outlet. That one wouldn't work on the plug.
So yeah, some ovens will be fine on a standard plug. Some won't. I wouldn't think an electric oven and electric hob would work though.
And yes, you'd need that gas pipe capping otherwise it will **** gas everywhere. Unless you can find somewhere further towards the meter to turn off the supply. Either way, you should get it checked out with a registered corgi fitter unless you fancy blowing up your house and the insurance not paying out. Or worse.