To view these videos online you require Adobe Flash player installed on your system, and Javascript enabled.
If you experience difficulties installing or using the Flash player, you can download the videos to your computer using the links below.
Please note: This video is supplied in mpeg format and file sizes can be quite large.
To save to your computer, Right-click and 'Save Target As'.
Social media
Javascript is required to use HSE website social media functionality.
Follow HSE on Twitter:
Follow @H_S_E