With respect to your query, I've done a bit of work on establishing links between the HWB and scrutiny.
In the London Borough of Waltham Forest, we aleady have a shadow HWB which is chaired by the Chief Executive. We were looking to invite him to our next health scrutiny meeting however wanted to present to him a briefing on how scrutiny would interface with the HWB as well as the local Healthwatch.
Whilst researching this, I found there are numerous breifing papers on what the white paper/ Health & Social Care bill will mean for local government but nothing which shows how a the various oversight organisations will work with each other.
As such I have put together a flow-chart which provides an 'at a glance' view of how things could work in Waltham Forest and have made recommendations to the Chief Executive. This is not set in stone, because we are awaiting the outcome of the bill but its a start.
I've tried to attach the file to this post, but it appears I am unable to do so. If you send me your e-mail address I can send this onto you.
My e-mail: firstname.lastname@example.org