I carry 3 locks with me a Abus D lock a Knog Strongman lock and a Knog coil lock thingy....the Abus and Strongman are tied with bungee rope thingys to my back pannier rack and the coiled lock thingy is wrapped around my seat post or just under my handlebars...I take no chances with my bike...I think 3 locks and different ones at that is quite a good deterent to thieving wee scrotes..
Also forgot to say my Brooks saddle is locked to the frame with a Kryptonite coil lock all the time so I have 4 locks