If the employer has breached the terms of your settlement agreement by, for example, not paying your termination payments or providing you with a reference to future employers, then they have terminated the contract in breach and may be liable to pay you damages for your losses.
You must present the defendant with a civil claim and issue court proceedings in the County Court.
If your expected damages are under £10,000, you may issue court proceedings via the Government’s Small Claims Track Online System: https://www.gov.uk/make-money-claim. The issue fee will be no more than £410.00. A party cannot normally recover solicitors’ costs on the Small Claims Track. However, it is designed for non-lawyers (known as “Litigants In Person”). The trials are relatively informal, and the judges do not expect parties to have the same legal knowledge as experienced solicitors and barristers.
However, if your expected damages are between £10,000 and £25,000, the claim will be allocated to the Fast Track, and if damages are over £25,000, it will be allocated to the Multi Track. These tracks are much more formal and legally technical, and it is expected that both parties will instruct solicitors. The normal rule on the Fast and Multi Tracks is that the winning party (either at a Final Hearing, or through a negotiated settlement) can expect to receive most of their legal costs from the losing party.
If your claim is worth over £10,000, I strongly recommend that you instruct specialist commercial dispute resolution and court litigation solicitors to advise you and conduct the litigation. If you cannot afford legal costs upfront, you should contact your home or business insurers and ask if they will cover your legal costs under a legal expenses insurance policy. They will either pay your solicitors’ fees or appoint a law firm on their panel of solicitors to act for you.