Hi Richard,
Solution Grove specializes in Open Source for education and would be thrilled to work with a teachers group in the UK. Our resume of ELGG work is here: http://www.solutiongrove.com/xowiki/elgg_work.
We also have experience in many other Open Source tools for education including Moodle, LAMS, Sugar and dotLRN and are passionate about helping teachers use technology to improve learning.
Thanks,
Caroline
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