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The D1000?
It's proven to withstand sustained angle-grinder attacks at least 20x longer than standard D locks.
Some thieves will take the risk for the more expensive bikes.
My downstairs neighbour's motorbike was stolen by theives from outside the house. Big FO Almax chain. Nothing he could do as there were ~8 of them outside threatening him with a knife if he came any closer. Took them 5 minutes to get through the chain. Police didn't turn up in time to stop it happening.
Greenbank-
I hope he had a good tracker. The best trackers have an amazing success rate at getting motorbikes recovered. 90% or better! A guy I know had his bike stolen 3 times when fitted with a Biketrac tracker. Each time it was recovered the next day, undamaged.
Have you looked into bicycle trackers? As far as I know, none of them offer the motorcyclist-level of service, where you get phoned up in the middle of the night if your bike is moved. If you say that it's not you who's moved it, the tracker people call the police, who apparently respond instantly because they have such confidence in the system. The thief doesn't remove the tracker because it's hidden and he'd need to dismantle the motorbike to look for it.
More info on motorcycle trackers in case anyone's curious: https://www.bennetts.co.uk/bikesocial/reviews/products/security/trackers/best-motorcycle-tracker#5
nick_h.
What about the Hiplok?