I have left my job anyway, but do I have a claim for constructive dismissal?

You would only have grounds to claim constructive dismissal if you resigned because of your employer's behaviour. It has to be shown that the employer's conduct is so serious that it amounts to a fundamental breach of conduct, which goes to the heart of the employment contract.

Examples include:

• making it impossible for you to do your job safely
• making a major reduction in your contractual pay and benefits