As mentioned above, your employer has a legal duty to look after your health and welfare at work. If you have suffered an injury due their negligence in performing this duty, you are within your legal rights to make a claim against them.
In addition, employers are required to have employers’ liability insurance, so any claim you make against them should be handled by their insurers.
It is important to be aware that your employer cannot legally fire you for asserting your rights. However, this is not to say that it cannot happen. If an unscrupulous employer wanted to dismiss you for this reason, they might do so, but it would result in much greater legal difficulty for them as you would have clear grounds upon which to make an unfair dismissal claim.