This chart displays the actual data received from the three APIs over time. It will be noted that the Haven Bridge tide times align closer to Lowestoft times than to Gorleston. It is for this reason, plus the fact that the Lowestoft API is updated more frequently, why the Haven Bridge and Vauxhall Bridge height estimates are based on the Lowestoft tide gauge.
This uses Environment Agency tide gauge data from the real-time data API (Beta)