Free Traffic Legal Advice

Please help,

On leaving a dual carriageway, 60 speed, there is a national speed limit sign at the entrance to a roundabout.
The left turn has its own slip lane which then turn into two. I began accelerating to 60 and moved to overtake vehicle, looking for clear space. Mine is electric, so it accelerates quickly.
However, within 30 metres there is a 30 sign, that is actually occluded partially by 2 lampposts.
On seeing the 30, I began to reduce speed, caught at 42, down to 32, in next picture 40 mtrs later.

Is it likely I appeal on the grounds that the signage / road structure is setting people up to break the speed limit?
Apparently, it is a zone of frequent speeding, and I can now see why!

Thanks in advance for help.
L