“In a personal injury action the fact that the claimant has won on some issues and lost on other issues along the way is not normally a reason for depriving the claimant of part of his costs: see Goodwin v Bennett UK Limited[2008] EWCA Civ 1658 . For example, the claimant may succeed on some of the pleaded particulars of negligence, but not on others. Indeed the fact that the claimant has deliberately exaggerated his claim may in certain instances not be a good reason for depriving him of part of his costs: see Morgan v UPS. A defendant who has obtained video surveillance evidence is perfectly well able to protect his position on costs by making a modest offer under Part 36.”
“Nevertheless in other cases (as stated above) the fact that the successful party has failed on certain issues may constitute a good reason for modifying the costs order in his favour. This is commonly achieved by awarding the successful party a specified proportion of its costs. In Widlake the facts were so extreme that the successful party was ordered to bear all of its own costs...”