Free Traffic Legal Advice

aware I am a bit unecessarily wordy!

You were right the first time because although you wrote a lot you appear to have omitted to mention where this occurred?
A Streetview link would help.

But, more importantly, please go and check that your address is fully correct and up to date on your V5C.

Thank you for taking the time to reply.  Apologies for the delay in coming back to you, I have not been well.

The address on the log book is up to date.

I haven't included an exact location because, as I mentioned, I'm not exactly sure where it happened and I didn't know that it was relevant to my question of whether I should chase up the PCN.  You've now clarified that it is.  I can't streetview to an exact location (as I don't know exactly where it occurred) but it's the bus gates in Brighton along the Old Steine area.  I found a map of them here:

https://www.brighton-hove.gov.uk/sites/default/files/2020-10/Bus%20lane%20enforcement%20Valley%20Gdns%20%28003%29.pdf

I know there are enforcement cameras there as I believe this is one of the most profitable Bus Gates in the country according to press reports.

I have done a bit of research and I now understand that if you drive over the words "Bus Gate" then this is where the contravention will have happened (ie not like Bus lanes, which have bus lane written periodically along the lane in question), and as I said in my OP, that definitely happened, as that's when I noticed the issue.

Looking at the map, and thinking about where we came from, my guess is that he drove over the red line and the green line, crossing the Bus Gate at the end of North Road.  We definitely turned left onto Trafalgar Street (as I was yelling at him at this point to turn left!), so without going back and double checking the road markings there, the only possibility must be that I noticed us driving over the Bus Gate markings at the end of North Road.

I did read that Bus Gates are not like speed cameras, and they don't get triggered automatically, but there are people watching the cameras? So presumably possible to make more errors which could be why it's not arrived?  I've also read though that they have up to 28 days to send it (longer if DVLA are slow), although this doesn't give you any time to chase it and keep within the reduced payment period?  I think it happened on Saturday 31st August.

I've just checked the postbox and the PCN has not arrived yet, so my question is whether the best course of action is to chase it up, or to leave it? 

Ok thank you - yes I think that was where I noticed driving over the words Bus Gate! But I do also think he probably (but not definitely as I wasn't paying attention at this point) drove past the camera/bus gate at the end of North Road as we came from the seafront.

But you've answered my question re waiting for the ticket, thank you.  I'll wait and come back if there are further issues.  Many thanks for taking the time to reply. 

OK thank you for confirming.