Small aquatic, long tail, 2 pairs of legs at front, dark colour, could possibly be eyes at front of head.
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Larvae of one of the Odonata.
There is a guide at
By one of this site's regular contributors. Assuming I'm right, he'll probably offer a species; or you could have a go yourself.
(The site unfortunately doesn't like Firefox, so I have to abandon my favourite browser to visit it.)
Hi Chris and thanks. We do get Red Damselflies around the pond. I'm not sure if they are large or small, but it is likely to be them. Bev.
Lat/Lng: 51.6, -0.8
OS grid ref: SU8595