You have the option of claiming constructive dismissal.
This is where the behaviour of the employer is such that the employer breaches an implied term in your contract of employment that you should be treated fairly and with respect. From the information you have supplied the cumulation of all the points you raise add up to unfair treatment.
I would advise you to look for a local solicitors as many will give a free first interview where your situation can be looked at closely before you make any final decision
You should inform your employers that you have 7 days to reply under the policy which will, hopefully , give you the time to fully consider your position.
If there are any further points please reply
I have spoken to a local solicitor who wanted to charge me £480 upfront for a settlement agreement and then 10% of any reward given. Do you think this is a good deal and from your experience do you think my case is strong and do you have any idea of amount i am on a 26k Salary.
I would shop around some more solicitors. I would expect you to be able to find a firm that will give a free initial interview.
Your case is strong based on what you have told me but needs to be fully explored.
I am afraid I cannot give you any indication of worth based on the limited information we have but it will certainly be worth pursuing.