Challenging a speeding conviction

[Roastparsnips]

I was clocked doing 37 in a temporary 30 zone.

I was planning to challenge it because the signage was very unclear (you could see 3 lots of 40 signs from the speed camera -- these have now been changed).

Stupidly I got the court date wrong so I was convicted and fined in my absence.

Today I read that other people have challenged the same fine and been let off for the same reasons.

www.standard.co.uk/news/transport/motorists-caught-by-londons-most-lucrative-speed-camera-cleared-in-court-due-to-confusing-signs-a3447106.html

I haven't yet paid the fine. Is there anything I can do?