Congestion Charge PCN

Happy New Year all (not TFL),

Drove into Soho Sunday 21st December from Hyde Park Corner onto the A4. I havent driven into the CC for years so I checked the sign as driving onto the A4 which stated: Congestion Charging Zone: Mon - Fri, 7am - 6pm. So all good.

I received a PCN today for that drive and checked online that they started charging Sundays 5 years ago (although the first website to pop up on google for me from 4 months ago says there is no charge on Sundays.

I'm obviously thinking of contesting as their signage is out of date. Would appreciate other's input please

I will be very surprised if they've left out of date signs especially at a major location.

Here?

Fair one, I could have sworn it was different and on my google maps on my phone, the sign is just mon - fri

As usual, for meaningful advice please have a read of
https://www.ftla.uk/civil-penalty-charge-notices-(councils-tfl-and-so-on)/read-this-first-before-posting-your-case!-this-section-is-for-council-tfl-dartme/

and post up there
(use
ibb.co or
for posting images.
Wherever possible, use the BBCode.)

a brief account of the circumstances which led to the PCN,
all sides of the  PCN (only redact yr name & address - leave everything else in),

a GSV link to the location,
and any council photos/video.

Fair one, I could have sworn it was different and on my google maps on my phone, the sign is just mon - fri

Well, now you know not to rely on satnavs as they are alway out-of-date. Which did you look at first, Google or the actual sign ?