Electoral promises are meaningless because politicians are able to lie to gain the favour of the electorate, and then do exactly what they want once they have it. Then there is no accountability or recourse, other than waiting another 5 years or so to vote them out and replace them with someone else who will follow the established template and do the exact same thing.
What's for lunch and dinner today?
Wood burning stoves on the way out? Possible on-the-spot £300 fines