Orange/brown animal. 28mm. Long antennae. Double tail.
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Thanks andyk for the info. It's not always easily found on the web.
Have just bought yet another ID book and have learned that the 'double tail' is a pair of legs; which means my specimen has 22 segments - or more if I didn't count correctly.
Using Andy's ID, I did find a NZ site; http://soilbugs.massey.ac.nz/chilopoda.php
which has good straightforward info on chilopoda.
Lat/Lng: 51.224166, 1.193705
OS grid ref: TR230520