If you signed the employment contract with a job agent in UK, the job agent could be held liable under the Agency Law which I believe is also being observed in UK. Qatar principals are normally represented by job agents overseas unless you are one of those classified as "Direct Hire".

These agents sign an Agency Agreement with foreign employers with provisions for joint and several liabilities in the event of breach of contract by the principal.

Any breach of employment contract by the employer/principal is subrogated to the agent for reasons aforesaid. Courts normally grant relief in the form of damages or lost opportunities brought about by the breach.