Hi Nikki, many thanks for your patience. Having read the messages, I can certainly see why you would be concerned as they certainly do not appear to be rational or be sent by someone who would reasonably be seen to be of sound mind (at least at the time they were sent).
In terms of your options, you can indeed consider a harassment complaint against him. The messages can certainly be seen and used as evidence, although the main issue there is that it is entirely in the hands of the police to decide whether to take this further and how far to actually go with it. So the least you can do is to report it to them and then they decide what to do with it next.
It is also possible to make a civil claim in the courts for harassment, under the Protection from Harassment Act 1997. If a civil claim is made in the courts, it must be initiated within 6 years of the alleged act(s) of harassment taking place. The court can make an order instructing the harasser to stop their behaviour. If they still do not stop harassing the victim it would become a criminal offence and they can be prosecuted in the criminal courts. It is also possible to seek financial compensation if financial or emotional losses have been suffered (e.g. causing severe anxiety or distress).
In terms of employment rights, constructive dismissal would be the usual way to take it further, however you need at least 2 years’ service to be able to claim. As I see no legal exceptions to this here you may be prevented from claiming that.
In any event, the best way to go about this is probably to try and get a settlement agreement from the employer, where you are paid off to leave and in turn agree not to make any claims against them. Try to negotiate to get something you would be happy to leave with, but if that is not possible, you may have to seek the above options as an alternative.
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