A fantastic (and sometimes rambling) address of the Liverpool Head Constable in 1852 (revised 1879). There is more but these are my favourite bits - most still relevant today:
'As I am about to speak to you at great length I wish you to stand in as easy a position as possible... changing your position as often as you choose; and in return for the pain I take (not trouble, for I dislike that word) I want you to lend me your eyes and your ears, and give me your best attention… In addressing you I will use very simple words, earnestly telling you what you