It is highly unlikely that there was ever a matriarchal society extant in the British Isles. There may have been one where men/women could attain equal levels of status (see Boudica for an example), but the myth of the all encompassing matriarch/mother goddess is simply that - a myth.

Many societies have chosen, what is in my mind, the better route, i.e. that of a matriarch or at least inheritance down the female line, but there is absolutely no proof whatsoever of there being a matriarchal society in Britain.

The Long Man, in my opinion, could never have represented the Goddess because it is simply too young (and the Goddess probably never came anywhere near the UK [if she ever existed as an all encompassing deity])

I am not dismissing individual, localised goddesses, but to even contemplate the global Mother proposed by so many is a farce.

Cor! Didn't I stretch my two penneth worth of soap box time!?