It's not at all clear where this bus gate is, because GSV has a number of views of different years. On the latest, I can't even see a bus gate sign. Here's GSV for May 2023 showing the exit to Arundel Gate off the roundabout. You can see the warning on the sign. The gate is 150 yrds ahead
https://maps.app.goo.gl/pEVW9j2atBkif34S6Then you have this sign
https://maps.app.goo.gl/Pf6jqdXRYSPJw3T87how you get to the Novotel is a mystery as you mustn't drive past the bus gate sign. Maybe Novotel guests are authorised !
However, it's all a bit puzzling because as you get to the traffic lights, there are no bus gate signs at all ! GSV still with the same year and month. So where is this bus gate ?
https://maps.app.goo.gl/fRvpf3mFkZcwjFGn9So what we really need is up-to-date photos.
I suppose what you could do is submit representations stating that you didn't pass any bus gate, and none are shown on Google Street View dated March 2023
You might also care to look at the video, the sole evidence of the alleged contravention, download it and post it here.