Blenkinsop takes up the post nine months after leaving the Scottish Media Group-owned radio station, and after acting as a 'consultant director' to Weber Shandwick for the past six months.
The director of PR position has lain vacant for more than a year following the departure of incumbent Sarah Taylor.
CNBC Europe vice-president of marketing Mark Miller said the position had been reinstated due to a need to increase the firm's profile: 'We've used outside PR companies and different agencies in the interim, but PR is crucial to our efforts so we have revived the position.'
He added that CNBC Europe's relationship with incumbent PR firm Hudson Sandler would be unaffected.
Blenkinsop said the offer of a move back into a PR role within a media outlet had tempted her to take the role: 'It was never my intention to stay at Weber Shandwick long-term - it's always been my aim to move back into broadcast media. The job seemed appropriate as it pulled together all of my skills.'
She will be the sole in-house PRO at the firm, but is tasked with assessing CNBC's PR needs and assembling a team accordingly.
Blenkinsop added that her role will centre on the positioning of the firm: 'My remit is to position CNBC as the region's foremost financial news service. It is a growing medium as increasing numbers of people want real-time financial news.'
Blenkinsop joined Virgin Radio in January 2000 (PRWeek, 28 January 2000), departing in December last year (PRWeek, 14 December 2001).
The move to Virgin followed nine months as head of internal and external relations at high-street chain Woolworths (PRWeek, 9 April 1999).