Solve this ‘wordoku’ in the same way as a sudoku with letters instead of numbers (the nine letters once in each row, column and nine-square cell). Once solved, one of the overall diagonals contains the jumbled surname of a British materials chemist, with research interests in, for example, healing polymers, nanostructured polymeric materials and membrane chemistry of fuel cells

This week’s letters are: C E H K L N O Q U