If you want the same type of humor, Douglas Adams also had the Dirk Gently books.
Terry Pratchett had a similar humor overall, particularly in his discworld series and the book Good Omens that he co-wrote with Neil Gaiman.
But sci-fi wise, I can't think of any.
If you go back to fantasy, you might be okay with Robert Aspirin's myth series. The humor there isn't as close, but it isn't totally different either.
John DeChancie did the Castle Perilous series that, like the Myth series, has a similar enough vibe to the humor that it might work for you
Sometimes the Phase series from Piers Anthony clicks in a similar enough way, but it's a stretch to recommend for this tbh. But Piers Anthony is sometimes a hard read in any of his series, no matter how good they are
But Adams is the only one I know of that did that absurdist, dry British humor in that exact style. People have tried, but failed, because they set out to imitate it, which is a fail from the beginning. And I haven't run across anyone doing it in a sci-fi style that's scratched the same itch at all