If you are dismissed in circumstances that the business that you work for is being bought and/or the overall provider of a service is being changed, you might have a claim for unfair dismissal.  In fact, if you are dismissed in these circumstances, your dismissal could be deemed to be automatically unfair.  This means that your employer will not be able to argue that they acted reasonably in dismissing you. As with ordinary unfair dismissal claims, you will need to have 2 years continuous service in order to bring an unfair dismissal claim.
If you are concerned that your rights have been breached, it is always advisable to speak to a specialist employment law solicitor as soon as possible. Truth Legal might be able to bring a claim for you using a No Win, No Fee agreement or we might be able to use your Legal Expenses Insurance to bring a claim for you at no or very little cost.
Our page on unfair dismissal claims provides further information about these types of claims.