Just came across this post on Bike radar about the security bolts:
Most off the shelf 'tamper proof' like the pin filled are pointless, you can get the tools, or often ping the pin out with a screwdriver anyway!
A lot of 'coded' tamperproof are likewise pointless, I know of 2 car manufacturers whose locking wheel nuts involve a fixed location and a variable one as the code, remove the variable one and your tool fits all.
I can remove most bolts using an electric drill (in reverse) and a special tool you can buy from most automotive factors that bites into the bolt head.
Any thoughts? Any thief able to recognise a brooks saddle or who is used to stealing parts from bikes like disc brakes would surely have a hex tool or whatever in their arsenal? If they can spend a lot of un-earned money on a something I can't afford (a van for transporting their ill gotten goods), surely they can afford a cheap hex tool to undo those kind of bolts? I'm again leaning towards using a chain and padlock for the saddle, lol.