An agency may purchase the services of a third-party agent (for example an external procurement consultant) to advise, arrange or manage a procurement, or part of a procurement, on its behalf. You should not purchase procurement advice from a supplier with a commercial interest in the contract opportunity.
You can’t avoid applying the Rules by using a third-party supplier to do your procurement for you. You can’t avoid accountability for the actions and decisions of your agent. Even if your third-party agent is another government organisation that’s not required to apply the Rules, if you are required to apply the Rules, then they are required to apply them on your behalf.