Do I have to tell my employer I have BPD?
In the UK you are not legally obligated to tell your employer about any medical conditions, whether mental or physical. Whether you tell your employer is a personal choice, but you are not obligated to do so.
There can be benefits to sharing your condition – your employer can be more aware of your needs at work, and can help prevent situations where you may become stressed, anxious or overwhelmed.
Ultimately, it is your decision to make, and you can say as much or as little as you like.