Many thanks for your patience. Whether you can try and negotiate more will really depend on the employer. They may have a maximum figure in mind which they would not go past and it may already be the one that they have offered you. At the same time their first offer may not be their best one so there could be room for improvement. Your best chance of negotiating for more is if you can show that you have a potentially valid claim against them which could cost them a lot more than what they are offering you.
In the circumstances, your situation could potentially amount to constructive dismissal, which occurs when the following two elements are present:
• Serious breach of contract by the employer; and
• An acceptance of that breach by the employee, who in turn treats the contract of employment as at an end. The employee must act in response to the breach and must not delay any action too long.
A common breach by the employer occurs when it, or its employees, have broken the implied contractual term of trust and confidence. The conduct relied on could be a single act, or a series of less serious acts over a period of time, which together could be treated as serious enough (usually culminating in the 'last straw' scenario).
So this is the potential angle you can take to try and negotiate further with them. Make it clear that you are expecting an improved offer (be realistic at the same time about how much you are asking on top) and state that if not greed you will have to resign and then pursue a claim for constructive dismissal which will cost the, a lot more in time and money to defend and therefore it would be in the best interest of all concerned if they simply gave you a better settlement and you can draw a line under it without further inconvenience and costs to either party.
This is your basic legal position. I have more detailed advice for you in terms of one other option you have to negotiate with them, which I wish to discuss so please take a second to leave a positive rating for the service so far (by selecting 3, 4 or 5 stars) and I can continue with that and answer any further questions you may have. Don’t worry, there is no extra cost and leaving a rating will not close the question and we can continue this discussion. Thank you