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 ferry once, by Eurotunnel twice and by Eurostar once. In fact, whenever I entered by ferry/train 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 bus/train entries actually not recorded in the UK (e.g. upon scanning my ID card), or did the Home Office choose to only provide me with the travel records involving API?