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Unfortunately the only other option you have if you are still not happy after your grievance hearing is to consider if your employer has behaved in such a way as to have breached the implied term of trust and confidence that every employee has implied into their contract of employment. If their behaviour was so bad that there has been a breach of this term then you have been constructively, unfairly dismissed and you will have the right to resign, although you will claim that it wasn't a resignation it was a dismissal as their behaviour had constructively dismissed you.
There is a case (Hogg v Dover College) that allowed a lecturer whom had been demoted to claim constructive unfair dismissal whilst still working in the demoted job and if you feel that could apply to you then you may make a claim without resigning.
As you are a PO you have two venues for a claim to either the Employment Tribunals see http://www.employmenttribunals.gov.uk/ and or the Civil Service Appeal Board see http://www.civilserviceappealboard.gov.uk/ . You are more likely to gain a positive result from the Employment Tribunal.
Thank you for the answer it was very informative. Only one question I am still unsure of? If after a period of 12 months, should they have given me the position substantively or is this an old wives tale? I have heard this mentioned many times but can not find it in writing. My point being, if they should have promoted me substantively after this period I would not be in the position I currently find myself in.
There is no legislation that states you should be given the substantive post after 1 month. I don't if there is any prison rules that state otherwise.