RCUK, with support the National HE STEM programme, have put together some short case studies detailing how academics have used public engagement as a pathway to impact. You can find these case studies here.
What is particularly of interest with these case studies, is the importance that the featured academics place on developing two-case engagement, rather than simply disseminating findings to a wider audience.
If you would like some support to do something similar around your own research, please do contact me on email@example.com.
Another opportunity to develop public engagement activities within a wider programme of learning, is during the Festival of Learning that BU is running next year. You can find out more here with a deadline for applications on 31st July 2012. Again, if you would like some help to put together your application, please do contact me on firstname.lastname@example.org.