Well I sent my original pump to a specialist for testing, they called me and confirmed it had a whine. I gave them the go ahead for a rebuild and asked them to test it afterwards. It's back on now and whining away just as before. Really at a loss with this one now, it really spoils the driving experience.
I am going to run it with some clear hose on the return pipe to see if there is any air getting in there...
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