Sorry to ressurect an old post, but I think this is important advice. I would never put my faith in a chain below 16mm and certainly not one with through hardened links, the site below should give all the chain advice needed and also sells 16 and 19mm chains:-
http://www.almax-security-chains.co.uk/(no afiliation on my part, not even a customer yet)
Their page showing videos of most popular (UK) chains being cropped in under a minute is an eye-opener.
It is always advisable to get a solid ground anchor to use at home , otherwise you are wasting your money, some of the anchors out there are utter rubbish.
I use a 16mm Oxford chain and an Abloy PL362N (Protec), but I am going to buy an Almax 19mm chain soon and downgrade the Oxford to my second bike with a second PL362N.
There is also a manufacturer that sells chains under the name 'Protector' in larger sizes that has a unique product called the 'anti-pinch pin' designed to pass through a small gap on a motorcycle such as a hollow axle, unfortunately it is for use with Squire padlocks only, but worth investigating if you have to pass your chain through a wheel which is easy to remove.
The bottom line is that if a theif has time and privacy, they can take anything, noise is their worst enemy - but if a tree falls in the forrest and nobody hears it fall?
Cheers
Your OK in my book little man, I was young once too. Many, many moons ago.
