Unless there are exceptions, it is either 6 months after expiation notice due date, 6 months after offence, or in the case of an offence that is not expiable—the proceedings must be commenced within 2 years of the date on which the offence is alleged to have been committed. While you may be OK, you still need to go to court and state why the offences should not proceed.
But depends on whether there has already been a court hearing many years ago and you didn't attend. If the court orders are just catching up to you I'm not sure that they expire. Might be worth a call to the police and tell them and see what they say.