The 1978 series is on Britbox/ITVx at the moment. There was also a series with Jemima Rooper as George from the 1990s though I can't see that streaming anywhere.
They're all - the 70s and the 90s series - on YouTube. I love them!
For all of Blyton's limitations and frequent one-dimensional writing, Michele Gallagher and then Jemima Rooper both played George very well as the character that she clearly was: a girl living in times when girls were denied a lot of the fun and opportunities that boys had, for no reason whatsoever, and she was obviously not willing to put up with that.
Why would we now want to seriously regress to a bunch of stereotypes, forcing children into narrow, uninclusive label-cages, when this was not even attempted way back in the 70s? How could it possibly be more enlightened to say that "Of course girls can be like this/do these things too" as opposed to "Girls can't be like this or do these things, unless we re-classify them as boys"?
Blyton herself exhibited a lot of what were probably seen as 'masculine' characteristics for her time in how she worked and lived her life - a soft, submissive, unworldly little housewife, she most certainly was not. But she never, ever for one moment claimed to be anything other than a woman.