Great news and hopefully the covenant is straightforward but unless you are very senior they are usually not enforceable
All depends on how they are worded. Covenant wording has developed over time and a firm which has taken good legal advice may well have very robust ones in place. Peter Cullum – ex-Chairman of Towergate – successfully sued a number of people for breaching their covenants, one to the tune of over £1,000,000. Indeed the defendant in that case had been quite bullish and blustered something in the press about covenants being unenforceable. The courts felt otherwise.
So, whilst you cannot restrict someone’s right to earn a living you cannot say ‘you must not operate as a hairdresser’ you can for example say ‘you cannot approach any of the current firm’s clients for 12 months after leaving the firm’
The grey area in this example is what happens if the current clients approach you but the general thinking is it is best to leave them well alone until the time period is up. A good firm with a good HR function though will be used to navigating this.
One of many excellent pieces from employment law sols:
https://www.lindermyers.co.uk/are-restrictive-covenants-enforceable/