Gov website:
Constructive dismissal
Constructive dismissal is when you’re forced to leave your job against your will because of your employer’s conduct.
The reasons you leave your job must be serious, for example, they:
- do not pay you or suddenly demote you for no reason
- force you to accept unreasonable changes to how you work - for example, tell you to work night shifts when your contract is only for day work
- let other employees harass or bully you
Your employer’s breach of contract may be one serious incident or a series of incidents that are serious when taken together.
You should try and sort any issues out by speaking to your employer to solve the dispute.
If you do have a case for constructive dismissal, you should leave your job immediately - your employer may argue that, by staying, you accepted the conduct or treatment.
Harass or bully is your angle.
Make some notes of examples of bullying and get other people to support you if possible.
Take it to HR to get it on record - if there's following bullying behaviour make sure they know immediately and if necessary tell them you will be seeking legal advice about constructive dismissal and leave immediately.
Note the key last point about acceptance because you stay.
It doesn't matter if it's the CEO he/she answers to someone.
And sometimes you just have to back yourself and your abilities.