I recently requested a full record of my entries and exits to/from the UK (which are kept for 5 years).

However, the record (the Semaphore database) only lists my entries and exits by air (always containing the flight number, airport of origin/destination and even the PNR), despite me having entered by bus three times and by Eurostar once. In fact, whenever I entered by land but exited by air, only the exit is shown.

AFAIK API data is only inserted when entering/leaving by air or optionally by the Eurotunnel train.

Are land entries/exits actually not recorded in the UK, or did the Home Office choose to only provide me with the travel records involving API?