oven isolater switch buried i.e. not accessible behind draws? Legal or not?

I am a qualified electrician and if you were renting the property it is not acceptable and as mentioned earlier it has to be accessible.

Although it isn't against the "Law" as all wiring regulations are non-statutary meaning that nobody can be arrested for not adhereing to them although it is deemed as "good practice" and a standard that everyone should work to. There is no legal requirement that home owners have to abide by and is completely their entire choice. However saying that i would always make the isolation "Local and accessible" and could easily be moved to somewhere else of your choice.

Listen to RJS. It's not ideal but nor does it HAVE to be accessible as the mcb is an acceptable means of isolating the circuit. The isolators are there for maintanance, not safety.

It's not ideal being behind a drawer basically the regs say the isolator needs to be accessible so it's open to how you want to interpret that. I usually put isolators for kitchen appliances in the back of adjacent units but not behind drawers. Most people who are spending a lot of money on a kitchen don't want walls cluttered with isolating switches just a few sockets. Personally I would get it moved into a base unit next to the oven to make it more accessible Should really be carried out by a qualified electrician fairly straight forward I should think so shouldn't be expensive.

The switch HAS to be accessible, for isolation and safety reasons, say for instance the oven was to develop a fault and caught fire? You have to haul the drawers out to switch it off, similarly with isolation for maintainance purposes.