If your employment is protected, this means a number of things:
You will be entitled to receive certain information about the transfer and your employer should also consult with your employee representatives in respect of any changes they envisage making.
The business that you work for should not terminate your employment because of the change in business owner or the transfer, except in specific circumstances and if particular steps have taken place. A specialised employment solicitor will be able to provide you with more information about when your employment contract can be terminated and the steps that the business would need to take to achieve this.
The company that you work for cannot make changes to your terms and conditions of employment after the business has been acquired or the organisation that provides the service has changed, except in specific circumstances. Again, a specialised employment solicitor will be able to advise you about this in greater detail.