In the twenties, that most fertile period in English (and French) literature, Virginia Woolf read Proust. She probably read him in French. I cannot imagine reading those endless sentences and paragraphs en Francais, but of course well-educated writers of that time would have little difficulty. Strangely enough, the beginning of the work reads rather easily in French. Go figure.
Here is an interesting account of Virginia's reading.
How Virginia Woolf read Proust