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@GA2G
If its daytime work, and you're only leaving the bike to pick up and drop packages, then a good thick armoured cable lock is the answer (not recommended for any other purpose other than courier use, and leaving for only unattended for only a minute or two). Wear it around your waist, if you're slim (and you are), and then have a serious lock for when you're at the pub and leaving the bike unattended for hours.
Interestingly, you've raised a very valid point - the weight of locks.
I shall amend the list and add all the lock weights that I can find, so people can make a choice based on that as an extra variable.