In the Telegraph today, sorry I can't do links, but at least he has definitely stated his side, though his reasoning is puzzling to me:
Pullman is hard to pigeonhole, and not everybody who agrees with his stand on freedom of expression will go along with his views in the great Terf vs Trans war (“I’m in sympathy with the trans side in this quarrel because I think that’s the side of the imagination, and I’m in favour of that.”)