Hi, I was looking to register with elesca also and wanted to know the exact same question, so I asked them,” how do I do a notify able job for you to assess when im not allowed to”, they told me that they will not check with building control and I could register the job once they had seen it. Seems to me it’s all about them getting their money.
You ARE allowed to do a notifiable job for your assessment, but you are supposed to inform your LBC beforehand and pay your (large) fee, then get it signed off by them after you have completed it. If you want to do it "by the book", talk to your senior building control officer (junior officers will quote the rules) and tell him/her about your plans. Some officers will allow you to go ahead and do the job as long as it is the one being assessed. All down to what you can feel comfortable with.