The appointments are in preparation for the spring launch of satellite TV channel Teletext Holidays TV.
Vizeum won the business following a three-way pitch against ZenithOptimedia and a pairing of John Ayling Associates and i-level.
Incumbent Manning Gottlieb OMD, which had held the account for seven years, did not re-pitch.
DLKW Dialogue won the online creative and e-mail marketing business from incumbent Alcone. Sister agency Delaney Lund Knox Warren holds the offline creative account.
Teletext marketing director Marc Bell, who led the reviews, expects customer-segmented e-mail marketing to play an increasingly important role in future growth.
Vizeum's Teletext account team will be led by managing director Trista Grant alongside communications planning director Stuart Newman.