Hey just needed to say that it's spelt harumble (I have a friend who says it all the time in texts and they've read the bleak expectations scripts so I'm p sure it's right) - sorry to bother you I just couldn't help correcting you!
Oh, sorry, I didn't realise. I assumed, since I understood it to be derived from 'hurrah', it would be spelt following that pattern.
Hang on, I have done a couple of google searches, and it seems that the spellings are interchangeable. I will be sure to tag with both spellings in the future... but if you have a definitive source, I would be quite interested to hear it.