Ah curiosity ...that's what is keeping me from the housework...are you sure you want to know!

If you go into the 1911 search page and clear everything you can then put a comma (or other random non-letter may work too) into the surname field.....
Then you just start thinking of occupations and put them in the occupation box and search...and it should tell you how many there are. Then you view the list and see who is there with that word. It may be that their occupation has more than one word so it's not that exact but helps you narrow things down.
You can start to narrow down by locality, other names in household, birth years etc if you are doing a serious search of course. (and obviously put a first and last name in the box if you were looking for a John Smith who was a baker for example)
Have fun!
Milly