You should certainly be informed about an application by those who are applying. When the Nursing Home applied for DoLs for my wife, they did not bother to inform me (par for the course) and I only found out when the assessor phoned me.
You may have already been on the Alz Society website but if not there is a lot of useful information here:
I was not informed by the CH either, despite being a very regular visitor. I was informed by the 'independent social worker' who was going to make the assessment with a psychiatrist.
The CH was very good, and always informed me about other things, so I can only think it was an oversight.