probation fact sheet and ERS's number at the bottom of the page. you should probably read bout it and ring them if anything is still uncleared. Not many of us has been through this before so our advise are probably not much help.
If an employer and an employee wish to have a probation period, they must agree to this in writing at the start of the employment relationship. A probationary employee is a permanent employee who is yet to be confirmed in their position and the probation period provides time for this to occur.