Nigel,

look back at your question. The answer you had in mind to be correct is 'North Pole'. The trivial answer that actually is correct is 'South Pole'.

My answer is part the many nontrivial responses.

To make it easier: My house is 2 ml + 512 m away from the North pole. What happens if you are 512 m from any of the two poles and walk east for 2 ml?

Wolfgang