Who can file an objection against my patent?

Any interested party

Can I file an objection against a someone else's patent?

If you have any interest

Are there specific deadlines/timeframes which I have to observe in connection with objection proceedings?

Yes.  s21 observations, for example, may be filed following publication but prior to grant of the patent in question.  Opposition proceedings need to be filed within the period specified in the Patents Rules 2007.  Revocation proceedings under s72 may be filed at any time; however s72(2) specifies a deadline where revocation proceedings are filed under the grounds set out in s72(1)(b).   

Who will take a decision on the objection?

Hearing Officer

Who can file an application for declaration of invalidity of my patent?

Any interested party

Can I file an application for declaration of invalidity of someone else's patent?

Yes

Are there specific deadlines/timeframes which I have to observe in connection with an application for declaration of invalidity?

Yes