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What's wrong with our Oak tree?

Hi, can any of you experts tell me what is wrong with our oak tree? I've had a google to no avail. The leaves have purple/crimson spores (lumps) with yellowish centres.
Many thanks
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I can't see very clearly, but they look like evidence of the activity of the Spangle Gall Wasp http://www.naturespot.org.uk/species/spangle-gall-wasp
Just one of the many insects that oaks provide a home for.
Not a problem.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
https://www.dropbox.com/s/19azkp8bnajbuoa/20140720_115820.jpg
https://www.dropbox.com/s/1i5pz8a2glyldwa/20140720_122936.jpg
https://www.dropbox.com/s/nhjsugeclzeovgk/20140720_122940.jpg
Yes, nothing wrong with it. Extra wildlife
The oak supports an enormous number of other species including several other gall makers. Google 'oak galls' and have a look, they're fascinating
In the sticks near Peterborough