I think there are two seperate threads in this: legality of notice periods, and ethics of notice periods (or more accurately, professional etiquette of notice periods).Your legal notice period, in UK law, is whatever you have agreed to in your contract, and some (such as my own) specifies my notice increases for each year I am with the company. I don't understand why people have such a problem with contracts - they are there to protect you, and aside of some unpleasant sophistry in IB around bonus payments, are a good thing. It is only where a written contract has not been provided (e.g due to admin delays or for a short period role) and where notice could be disputed that it reverts to 1 x payment term. But frankly the legality of notice periods is academic. The courts will always do everything in their considerable power to uphold the sanctity of contract as a pillar of law.the real issue is the etiquette of notice periods, and speaking as a HH although I have - occasionally - encounted clients who are dismayed to wait for a critical hire to complete their notice period, or would like a candidate to try and negotiate an early release from the contract, I have never encountered an offer being withdrawn, or even preference to a candidate on shorter notice, and at more senior levels the notice periods of 3 - 6 months are quite necessary to protect client information etc. I have even seen senior lawyers on 12 Month notice periods! When the time comes to leave, treat your company well - in fact treat them like you would be expected to be treated if you were losing a key member of your own team, not only because you have to, and you want a decent reference and a reputation as a stand up guy, but also because MC is a small world and you may well be reporting to old colleagues or managing them, even working client side with them. And for the sake of getting to your new desk a few week early are the risks, the loss of reputation, and - for some - losing out on the chance to take a few weeks out and take a break, watch the racing and chill before starting your new role - worth it? And another point, hopefully well illustrated. A while ago several colleagues of mine left to explore other opportunities, but they honoured their commitments, treated the company well, and left with the respect of our Directors. A few came back having seen the grass is not always greener and were welcomed back - because they left on good terms. Worth thinking about that.