DPC at floor level

The DPC of my house is at finished floor level. I thought all modern houses (post WW2) with solid ground floors were like this.

Below the external DPC is just 3 courses of LBC Tudor facing bricks and normal blockwork below and down to the footings.

Why do you need engineering bricks ?. They are not actually frost-proof as some believe, or are you referring to the inner leaf of the cavity wall ?.

The inner leaf of my house is standard blockwork up to DPC level, then lightweight blocks above the DPC. This would not meet the requirements of Part L nowadays.

Andrew