A Cyclist wrote:
Unfortunately for strangers the presence of streetlights if there were some, without any sign indicating a different speed limit, mandates a 30 mph limit.
I would go and take photos of the site of the alleged offence to use in mitigation should you need to, but as there is no risk of a driving ban you may have to put this down to bad luck and a slight lack of observation.
Not quite correct. Streetlamps can't be used to indicate a speed limit without the correct terminal signs. No signs - no enforceable limit. There is no allowable repeater signs though so if you think you missed the terminal sign while driving drive at or below 30 mph until you see the next speed limit sign.