my house was built in 1963 on a concrete platform of 300 thickness. I am building an extension and renovating my main house in the same time. both planning permission and building reg was granted Feb. 2019 by my local authorities in the south west. the work has started but due to corvid and other personal issues has not completed yet. most of the work has been done now apart from the sitting room which need to be fitted with under floor heating. I took off the wooden floor board and tried to fill the ground with hard core (bricks, type one stone, and gravel)on top of the original concrete floor, see pic. the building controller came last week and had a look at the original floor and saw the hard core outside the house that was intended to fill the ground with. he did nor seem to have an issue. however, he paid another visit yesterday which was a visit from hell. he sked me to take every things I put out, he was very sarcastic and asked me if I have a BC for this work which he did not mentioned in last week visit. I was rather shocked as I believed was covered in the original BC permission that was granted in 2019. I rang his department and a colleague of his told me the same thing. I am not happy with the and would like to complain about his bad attitude and manners. how do i need to approach? and what are the chances to ask for a replacement.