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@Fixed&Broken
I have a friend who's a big motorcycle nut. For the one year he was in his last house the cost of a ground anchor was less than half the reduction in his bike insurance cost. The landlord was quite OK with it as he knew the sort of people likely to rent the property would have bikes or a scooter. We just lifted one of the flags and filled the hole with concrete. I doubt the whole mission cost more than £15 plus the screw in anchor.
If it's really not an option then maybe look at other approaches such as Plantlock:
http://www.frontyardcompany.co.uk/products/plantlock.html
Nothing to stop you making something similar yourself with a metal bin, holes either side and run the chain through it, fill it with soil to give it mass. Combined planter and bike lock in one. While the bin might not be reinforced it would be a git to get the chain out of there.
Failing that just buy more bikes to lock together :)