Ians

The BBC were broadcasting an excellent folk music series on radio on Sunday mornings before the dates which you quote for Dylan and Baez.

It was also the BBC that gave Robin Hall and Jimmie MacGregor exposure to a wide television audience five nights a week on alternate weeks in an early evening news/magazine programme "Tonight" prior to the Hootenanny ITV show.
I speak from personal experience as I handled their bookings during that period in addition to running the Ballads and Blues Club from 1961-1965.

I think also that Hall and MacGregor (OK not a solo act)were signed to Decca before Felix but am not certain without checking.