BBV (in-universe)

A Doctor X VHS belonging to Giles had the BBV logo on the bottom of the spine. (WC: Case File - Varunastra)

Behind the scenes
While Case File - Varunastra confirms that BBV Productions exists within the DWU, the placement of the logo on the spine does have some ambiguity surrounding it, as it could mean that the in-universe BBV produced the series in the 1950s or were simply responsible for distribution of the VHS tapes.