Hello good folk of FTLA, I hope you might share you expertise with me on this one.
This morning I was issued with a yellow ticket and a verbal Notice of Intended Prosecution by two uniformed Police officers for entering into a timed No-Entry road in a residential street in Bristol. I am not local to that area so was unaware of this rule and I also didn't see the signs - but of course these were not good enough reasons to mitigate me from the offence and so a traffic offence report was given to me on the spot.
After been held up for far too long and having now missed my interview

I began heading home - but first decided to double back and check for the road signage as I could not recall seeing even one sign stating no right turn. I found that of the two No-Entry signs at the gateway to the road in question, one is at a 90 degree angle so impossible to see and the other is roughly at 45 degrees so although visible, isn't clear. Neither of the written signs (Mon-Fri 7am-10am) are visible from the approach I was coming from either.
Which leads me to wonder if I have a case to argue?
Here are the visuals:

The map from above - I was travelling from the bottom of the image (6 o'clock) and turned right into Cambridge St where the police were waiting tucked around the corner. Of course...

My view as I approached the Cambridge Rd junction. Notice the lamppost dead-ahead has the No-Entry sign facing at a 90 degree angle from this approach - so impossible to see.

The same viewpoint taken from Google Maps shows it a little more clearly as you can see the shadow cast onto he wall of the house from the sign. It also shows that the sign has been like this for at least 3 years...

As a comparison, if I had been coming from the left hand side (9 o'clock) I would have seen this view, which is undeniably clear - both the No-Entry signs are completely visible as well as the written timings.

Is this a clear enough gateway? Perhaps I should have seen the drivers side No-entry sign, but as I was checking for traffic coming from the left, and then the right, and then making the turn, I simply didn't see it.
It would be great to hear your thoughts on this one. Im sure I'll receive follow up correspondence from the Police fairly soon and am keen to know what the punishment is likely to be - points and a fine perhaps? I am also unsure if I will 1) be offered the chance to dispute it, and 2) if I stand a chance of winning - or will I just dig myself into a nice expensive legal headache of a hole?!