Is this “standard” for a built in oven?

Hi all, our oven has broken so I’m looking at a replacement. AO will install for a fee - I just want to check that they won’t have a problem with the plug.

Some stuff I read suggests I should have a red isolator switch - I don’t. Just the double plug in the corner cupboard. Left is oven, right is the hob.

I don’t want some installer to refuse to do it based on it not meeting building regs or some nonsense.

Is this “normal” for ovens? Thanks.