I note your concerns that you lack the finances to instruct solicitors at your own cost.
Unfortunately, I believe that you will struggle to find a solicitor who will act for you on a pro bono basis for this action. Generally, lawyers only offer their services pro bono in matters of public interest, life-or-death and personal liberty where the client does not have the financial resources to bring or defend an action themselves.
I think that you will also struggle to find a charity or other professional body who will be prepared to fund your case.
In addition, state-funded Legal Aid is now only available in a very limited number of types of cases, and this is not one of them.
Therefore, if you cannot finance your claim yourself and do not have business insurance, you should look to instruct solicitors on an “ad hoc” basis to review your correspondence and documents in full and advise you on your prospects of success before embarking on the litigation.
You may be able to find a law firm who is prepared to take on your case on a Contingency Fee, Conditional Fee Agreement or Damages Based Agreement basis whereby you will not pay their costs unless they win your case for you and either the other party pay their costs, or they take a percentage of your damages settlement or court award. However, you must search for and approach the law firm yourself in this regard.