I agree, this is partly about making people think that rob is a wonderful man with a flaky wife . He needs EVERYONE to admire him , including the HCP. He also wants to use them as part of his plan to get Helen completely under his control , by making sure that they are on HIS side and don't believe a word he says .
Rob has a master plan and it's not nearly finished yet . That's why I don't think this story line will need anytime soon ( sorry for those of you listening with your fingers in your ears ) .
Once Rob has convinced everyone that Helen is mentally ill, they will become worried about the welfare of the baby and Henry . Helen will become aware of this - either this concern is " real " and the HCP /SS will tell Helen or its in robs head , but he will tell Helen this and she will believe him.
Naturally Helen will be terrified of losing her children , which will make her even more hysterical and illogical . But most importantly , it will make her cling even closer to rob .
HE is the only one who can stop her losing her children . Remember that SS/HCP don't want to remove her children , and they won't do so if there is a reasonable parents and grandparent on the scene.
Which just proves to Helen that she can't trust these evil HCP who are out to remove her kids, Rob is the only one she can trust . She can't trust her parents or her friends - because they will be on the " side " of the HCP and tell her to confide in them and work with them .
Rob is her only hope of keeping her children , so she must do everything he says and confide in no one but him .
Result - rob has Helen completely under his control, aided and abetted by the NHS and perhaps SS. And everyone in Ambridge will think what a great guy he is .