Response Options and Feminism

How many women consider themselves to be a feminist?

Feminist self-identification was the subject of a recent BBC article by Dr Christina Scharff (King’s College London).

On social media, Kate Andrews (Institute for Economic Affairs) said that 90% of British women don’t consider themselves to be feminists. In response, the barrister Jessica Simor QC said that figure was actually 66%.

Which is correct: do one in ten or one in three British women consider themselves to be feminist?

10% or 34%?