Thompsons Solicitors was involved in the campaign for the inquiry and acts for a number of those who were infected after receiving contaminated blood. Patrick McGuire, a partner at Thompsons, branded Lord Penrose's decision a "terrible body blow to the many victims, campaigners and legal representatives who are seeking answers and transparency around this devastating scandal".
Mr McGuire said: "The inquiry can't possibly fulfil its remit without giving a definitive figure in regards to numbers infected and that is what the additional oral evidence on statistics would have examined. To conclude without this detail could be viewed by some as casting doubt over the entire process."
In his written decision on the matter, Lord Penrose stated: "The final report will deal with the evidence of all of the witnesses so far as necessary to ensure that the position is fairly presented. The lines of inquiry proposed are unnecessary for that purpose. The cost, in time and resources, cannot be justified. The exercise would inevitably delay the completion of the report.
"The sole application was to reopen the oral hearings stage of the inquiry and to call or recall the specified witnesses. That application is refused. There is no justification for further oral evidence."
Lord Penrose began hearing evidence from witnesses in the inquiry in March last year and over a total of 89 days he heard from 60 witnesses. The inquiry is expected to publish its final report next year.