Really unlikely, as VHS and Betamax wouldn't be created until several years later (1976 and 1975, respectively), and any tapes still in existence would be in formats that likely have no players anymore.
They MIGHT be lucky if it they find tapes in the same VCR tape format as the BBC's "Out of the Trees" from 1975. It was a sketch comedy show from Monthy Python's Graham Chapman and at-the-time-writer-for-Dr.-Who Douglas Adams, who would go on to Hitchhikers Guide to the Galaxy fame.
A copy was recently restored and put on Youtube after a tape in the VCR format was discovered. It was a home taping made by Graham Chapman himself, and the only existing copy of a recording. A multi-year effort was made to rebuild a player for the tape from scratch, with the final results put on Youtube.
So, it's potentially possible, the the real issue is that during the early years of the BBC they generally re-used the tapes they had and would record over previously used tapes, which is why so much of BBC history is lost from that period. Famously lots of early Dr. Who episodes are lost to time(lords).