I'm not sure what i can do or the best way to handle this situation?

Three years ago i reached an out of court settlement with my employers at the Employment Tribunal.My solictor negotiated the settlement with the company's solictor. The settlement was to be paid within six weeks. On the last day of the six weeks the company pleaded in ability to pay. I was advised by my solictor to come to some agreement with them as going to court would take time and no guarantee of payment. I took his advice and after another two months of talking the company agreed to pay some up front and the remaining amount per month, the whole settlement to be paid in one year. My solictor recieved full payment for his work out of the lump sum and half of the first two monthly instalments. Due to my marraige collasping i was living outside the country and my only way of communicating with my solictor was by email. He also at this time negotiated a seperation agreement for me which i returned to Ireland for, again he was paid in full out of the settlement and i await a futher sum to be paid in a few years under the agreement. The above detail is for background purposes. My problem is that the company did not keep to their agreement and i have had to chase my solictor by email to obtain some payment. at this stage i am still owed a substantial amount, and despite emailing my solictor to find out if there is anymore payments forthcoming he has not replied to a single email since Novenber 2011. I am also worried now about the payment outstanding re my seperation agreement. What can i do about this situation or what recourse do i have.

Thanks for reading this, i'm sorry its so long winded.