I accidentely met with an HMC inspector a couple of days ago. Alhumdulillah, he was at a takeaway for an unexpected inspection.
As i learnt he was an ispector, I metioned to him about the other products sold in the shops that are not labelled by HMC but people would blindly bye it because of the certificate. (obviously, this is down to the people themselves to check) and also metioned differences of opinion on seafood etc. As some HMC outlets serve seafood that is Halal in one school but hram in another. (complicated issue). I mentioned that I was Hanafi and don't eat squid, but Maalikis do and a particular HMC certified place was selling it. There needs to be a better guide because the general public wont do their homework.
Anyways, since they only certifiy meat and poultry, he said that they dig deeper once they are on site and check the ingredients of every item to make sure every thing really is halal. He also mentioned that they do this with the Muslim Shops as there are many non-Muslim HMC certified places too.
The conversation then continued and he mentioned that he goes as far as checking up on the cheese to see if it contained Rennet in the ingredients because it was Haram according to him.
InshaAllah, I'll post the verdicts from the Hanafi Scholars as well as Salafi Scholars. (Both agreeing on the matter)