Should the UK adopt a codified constitution?

i found this.. I'm doing the exact same question and i found the markscheme of a previous exam with this question.

Don't know if this is any help

but, it's what I'm using...as i find this question really difficult and on the verge of giving up.

Excel.com/migrationdocuments/QP%20GCE%20Curriculum%202000/January%202007/6492_01_rms_20070314.pdf">http://www.edExcel.com/migrationdocuments/QP%20GCE%20Curriculum%202000/January%202007/6492_01_rms_20070314.pdf