A private individual can record as much of the public as they want. It’s not illegal
Edit: Those ‘guidelines’ from the surrey fire private company are also dubious to say the least. Rules apply to organistations and even more strenuous ones to public sector organisations but a private individual can record what they like. By all means contact the Police/local council if negotiations with the neighbour fail and they can give some words of advice, but thats all.