Firstly in this context there is no "we", only one person is the registered keeper. Write to the council now:
Dear London Borough of Bromley,
Please be advised that on the date when you allege a contravention took place, the vehicle was registered in my name at DVLA and (full address and postcode).
However on (date) I moved to (new address and postcode), therefore this is my address for service. Service at any other address will not be good service. I attach the front page of my V5C as proof.
Yours faithfully,
If the council ignore this and send the NTO to the old address, there's grounds to claim a procedural impropriety on that point. Once you have the Notice to Owner, we can make a new representation dealing with all the various points.