Do I have any recourse here...contract termination by agent

[Wanderer]

From the 3rd day of a 10 week contract, I advised the agency that the client was hugely unprofessional in how they were working and that they were extremely difficult to work for. They had no clear idea of what they wanted, changed their mind frequently and demonstrated appallingly unprofessional behaviour. I advised this numerous times in the first few weeks.
it seems ludicrous, and hugely unfair, that the appalling unprofessionalism and blatant lies of the client lead to them terminating the contract with the agency, who in turn can terminate my contract IF the client at their "sole discretion", terminate the contract

It really sounds like you didn't get on with the client, don't get bitter and twisted about it or it will consume you. Just move on and find the next contract somewhere that you are valued by the client and can make a useful contribution.

If you didn't opt-out of the agency regulations then they still have to pay you so just invoice them for the time worked even if the client won't sign the timesheets. If the agent doesn't pay then chase the debt.

[SueEllen]

In terminating they have also only agreed to sign for 9.5 days of the 11.5 days outstanding, stating timekeeping - again totally spurious.

How have you recorded those days? Is it the way it's written down in the contract? If not they can argue that you haven't actually done the "days" agreed in the contract.

For example some clients bill by the hour but only allow you to do a maximum number of hours per day, there as others don't care as long as long as you don't bill more than an allocated number of hours per month.

This means in case one if you are suppose to do 7.5 hour days but did 8-12 hour days and billed them for 11.5 days they will reject your timesheet and invoice. There as in case two they will accept it.