Locks that work

Depends on how strong you are.

It's an excellent set-up, but how often would you need maximum security? Are you commuting to and from work/university? Wouldn't it be possible to leave one of the locks in place where you lock it up most?

You do get 10/10 for security, but I think a more useful option, might be an alarm........as is in the list. Calls for a different approach though.

I might just be paranoid but I'd rather not worry about my bike. 4 kilos is a bit on the heavy side I agree but as you mentioned, I might be able to leave one of the two locks at work from time to time. The things is I often work from different locations in London so whatever combination I use it need to be secure and somewhat portable.