Obviousness in Britain

See the post at IPKat titled Taking the pH? Trial judge's decision on psoriasis patent doesn't come up to scratch

As to a post-hoc "pick and mix" operation , recall the CAFC Unocal case.

Of the IPKat text: pHs are only possible if water is present. Recall from wikipedia: Hydrogen ion concentrations (activities) can be measured in non-aqueous solvents.