>As this is located at (AFAIK) Harwell,

Correct, on what used to be a wartime airfield, and became the UK atomic 
research centre (AIUI largely because of the proximity to Oxford 
University). The "atomic" (as the locals call it) is shut down and 
dismantling is well under way.

Now RAL is part of the site, with various scientific resources, ranging from 
a petawatt laser to neutron sources. Diamond is a part government, part 
Welcome Trust (along with some European Commission funding as well I 
believe) syncotron ring. Anyone driving along the A34 main route can see it 
as a big silver round building.

But I am not sure about the gamma rays you talk about, it may be able to 
produce them, but I believe most of the work is done using short UV 
radiation for examining molecular structures (which is why Welcome Trust are 
in the picture). 

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