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I am afraid that there is no law that states how long a probationary period should be. A probationary period is just a contractual provision. It doesn't matter whether you are on probation or not - your statutory employment rights still exist from day one.
For your employer to be able to extend your probation period there must be a contractual term allowing them to do so. If they don't then they will be in breach of contract.
As you started in August 09, whether you had a permanent contract or not, your employment rights are limited and you are not fully protected. You only get enhanced rights after you have worked there for a year. Until then you can be dismissed for no reason (as long as it is not discriminatory). Therefore I would be cautious as to how you approach this until you get a year's service as your employer can dismiss you for almost whatever reason they want. If you can hold off until August then you will be much better protected for making a stand.
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