If asked what the one thing leaders can do to better enable the spread and adoption of good practice in their organisation, it would be - "Be a role model".
I wrote in this blog on this topic back in May: "Why don't we search for evidence."
It's no good leaders exhorting that their staff need to adopt good practice and to use "evidence" if they don't do the same. There's no quick fix. There's no substitution.
Next time you wonder why it is your staff don't search for, adopt or actively spread known good practices, then ask yourself when last you searched for or adopted a good practice.