Free Traffic Legal Advice

Hi everyone,
I parked on a single yellow line close to Holland park station in London on the carnival day on 25th of August. I checked every where around the car but there was no sign of 'no parking allowed'. I only saw a sign about no parking in the residentials bays on the carnival day!
I returned to my car and I found a PCN on my screen. The officer attached a picture of a small sign from the other side of the road with very unclear wording saying that I wasn't allowed to park on the single yellow line on the carnival day. I uploaded the pictures in ibb as it was too big to attach them here.

I would really appreciate your help to write an appeal for this fine.

Thanks

https://ibb.co/hKStZLn

https://ibb.co/Rpr3GVP

https://ibb.co/2d8ByxR

https://ibb.co/wSWCthk

Deleted. Posted in wrong topic.

No, your post is still visible. I think Encedalus just posted something intended for another thread by mistake, then deleted it.

Please reinstate the PCN details at suggested by Stamfordman, and also it would help if you posted a Google Street View link to the location where you parked, so we can see the signs and lines on the road.