> The big problem I have is that for some reason the polygons are all
> being linked by a line. You can see this 
> athttp://www.phased.co.uk/GBBR/viewcycle.php

It's not your webpage code ; you can paste the GPX url
  http://www.phased.co.uk/GBBR/retrieve-gpx.php
into maps.google.com searchbox and see the same effect.

It's your GPX generation ; examine the GPX returned by pastingthe URL
directly in your browser, and you can see that Wiltshire and Rhayader
share the same starting points, 2nd point, etc etc.

I guess it's a dynamic GPX from a php script ; I'd further guess that
it outputs each track section from an array of points, and your array
is not being cleared down between track enumerations. Each new track
extends and incorporates previous ones...

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