Free Traffic Legal Advice

The sign before the bridge is behind the traffic light array.The GSV view doesn't show the approach from a driver's view in the LH lane. It might be obscured. On the other hand, there is a repeater sign after the bridge: -
https://maps.app.goo.gl/GLeRsoRrUfHk9KpQ6.
So the contravention seems to be made out, but suggest you check for obscuration of the sign as suggested above. The other sign is past the junction, so if you committed yourself because the other sign was obscured, it would be too late to change your mind, as you could cause an accident.

In addition, go onto their website, and go to their page for submitting representations. Please take a screen capture of the grounds for an appeal and post it here. Councils sometimes get this totally wrong, which makes it a procedural impropriety. Mr 'Hippocrates' may also post further on this aspect.

Thanks for your replies.
Here is the screenshot of thier website for grounds to appeal.
In the PCN I also got a representations in respect of penalty charge with it which I've also added a link for.

https://cdn.imgpile.com/p/uubVON8

https://cdn.imgpile.com/p/rXVXc0f

To me that first sign seems to be for the right turn before the bridge.

If this is a 30mph zone the sign must be illuminated and it does look to have a lamp.

I would, but I don't think I'd take it to the Traffic Penalty Tribunal unless they ****-up their inevitable letter of rejection. I don't agree with SFM on the sign possibly applying to the turn into the race course, because it is after the traffic lights and the green phase does not have a direction arrow to indicate straight-ahead only. For me there is an issue with obscuration of the sign after the traffic lights both by the traffic light array and vegetation:-
https://maps.app.goo.gl/bk28u3tXoExG8tYU9

Looks OK, but don't expect them to fold and cancel the PCN.  Post up their response when you get it

Thanks sent the appeal I'll post when they get back to me.

I don't think you have the basis of a 'slam-dunk' win at adjudication. Of course you have the absolute right in law to take them all the way to the adjudicators, and risk the full PCN penalty. My own view is this would be a gamble and not with good odds.