Hi, surely if it's a gas hob the landlord would/should have had a landlords gas cert. The gasman would have then condemed it as a fire risk. It's a big no no get your landlord to change it before some poor sole gets hurt. It's 450mm to the side nevermind 300mm direct.
Unless you are scorching the cupboard correction will have to wait until a new cooker is fitted, it is then that the installer should refuse to connect.
Well.. the corners do overhang the actual hobs and when frying bacon a week ago some fat spat out and caused a flame which put black soot over the corner of the cupboard which is what caused me the concern. I will mention this to the landlord though and see what he says.