SteveW
I think you are seeing the "action plan" option slightly wrong. It is really a kickback from the Enforcement Concordat, where before taking formal enforcement action we are to discuss how the problems can be solved by informal means. Most RP's will accept this alternative, but it is not being put forward just so that nobody has a right of appeal. It is informal, you have the legal right to lie through your teeth then not to do any of the work, since it is not a legal notice, however if that happens it will simply end up as enforcement, and you then have the right of appeal.
Telling people that enforcement notices are available for the public to see is not a threat, they would almost always be relevant notices, and are a matter for public record. It is my personal opinion that if enforcement is downgraded to action plan then it should still be a matter for public record. (If it is important for enforcement notices to be available to the public, then any building of a poor enough standard to be enforceable should form part of the same records regardless of the method used to ensure compliance)
Cleveland, a deficiencies notice is generally a 'notice' that doesn't get followed up. More of a confirmation of a few less serious issues that should be addressed. This is US telling the RP what is required. This would only normally be served on a premises where the general standard is high, and we can reasonably expect the RP to take heed of whatever is found. At action plan level, it should be the RP telling US what he is going to do to rectify more serious faults, it gets an agreed timescale and always gets followed up. It gets enforced if it passes the timescale. (It often ends up with us telling the RP what needs to be on the plan though)