SAPUI5 Data Binding to a SimpleForm

I am having issues trying to bind data to a simple form. I am using a mock server and have successfully bind data to a list/table

My manifest.json looks like this

"mock": { 
     "dataSource": "mainService"
 } 

My mockdata(UserDetailsSet.json) looks like this

[{ "ID_PassNum": "cu001", 
     "Title": "Mr", 
     "Name": "Don", 
     "Surname": "Ownery", 
     "ResType": "SA", 
     "Country": "South Africa" 
}] 

My SimpleForm fields looks like this

<Input value="{mock>/UserDetailsSet/0/Name}" />

<Input value="{mock>/UserDetailsSet/0/Surname}"/>

I have also tried this

<Input value="{mock>/UserDetailsSet/('00001')/Name}" />

<Input value="{mock>/UserDetailsSet/('00001')/Surname}"/>

What am I missing?