Volunteer gave good quality mark, scanned and super-imposed onto image of £50 note. The background of the note ensured to obscure majority of the ridge detail. 14 copies checked for consistencies. Finger mark and corresponding set of 10 fingerprint marks given to ps, donated by same volunteer. Every p allowed a fingerprint magnifying glass. Volunteer ps told to act as typical day but not discuss prints, no time limit. Done anonymously- given unique reference number. Given file with details, high or low context. Asked to assess if match or not or not enough detail.