In reply to Removed UserBoingBoing:
Even if it does contravene building regs, who on earth (from the land of officialdom) is going to know it is the case in order to carry out any form of enforcement?
FWIW when I fitted mine (electric cooker) I ensured they were aligned (by putting the cooker in first then adjusting the cabinet legs to match), but that's because I'm picky. If 7 years on there has been no issue, as others say who cares?
If it posed a fire risk it'd have gone up by now.
FWIW if you are bothered you may find the cooker has adjustable legs to alter its height.
Post edited at 14:56