Burak Gürsoy#Cinebook caught up with the English editions of Blake & Mortimer with the volume 30: Signed: Olrik.
That leaves only the last volume listed, which was released last year. They seem to have caught up with the numbering as well.
Even though Cinebook usually publishes all of the volumes of such series, their numbering is a mess and don't follow any of the originals. Maybe something to do with previous English editions, although it escapes me why they'd care at all.
Comic Crusaders