original: It is the central datum point for measuring distances from London.
simplifications: It is the starting point for measuring from London. It is the central point for measuring distances from London. It's the point for measuring distances from London. It is the main data point for calculating distances from London It is the central point for measuring distances from London. This is the central point to measure distance from London. It is the center data point for measuring distances from London. It is the central datum point to measure distances from London. It is the central fixed starting point for measuring distances from London. It is the central data point for measuring distances from London.