This is a clip of three different types of Stirling engine. A low temperature, a ringbom and an alpha configuration. All three were built by Graham Hollis from designs by Jerry Howell.

Marv Klotz runs several of his engines at the Vista 2005 exhibition. 

Jim Endsley running his PM Research 2A at the Vista 2005 exhibition

Interesting display from Men, Metal and Machines (MMM) exhibition 2005

Another interesting display from the MMM exhibition 2005