Which has Changed: Gas or Eggs?

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I enjoy boiled eggs.

Formerly, i.e. up to 2005, I would place the eggs in a pan of cold water, bring to the boil and boil for about three-and-a-half minutes - for large eggs - for a perfect result.

Now, I find that boiling just for 2 minutes 20 seconds produces a slightly over-done egg.

Any ideas?

Until the next time - if there is one