THanks to Kaiser and SD1too for your comments. This make three of us that think that although the bolt is being stretched, it is still in the elastic range, so reuse should not be a problem so long as it has not been abused by overtightening before.
I'll now be quite happy to reuse original bolts, as others do. When I use the new Indian bolts I will check the washer and grind off the lip if necessary as I'm sure its presence results in incorrect tightening.
Re threadlock, its use on these bolts is not specified, so should not be used.
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