Colin Plant's FSC Key to Lacewings and allies has this to say about snake-fly larvae:
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The larvae are predatory on beetle larvae and probably Diptera larvae, and live under loose bark where they are frequently mistaken for beetle larvae themselves; there is as yet no reliable means of separating them from each other apart from breeding them through.
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Arp has listed the 4 British species, although there may be a fifth in the highlands of Scotland. From the distribution notes in Plant any of these might be present in Stony Stratford.
HTH,
poschiavanus