[NickPollard]

This only works if the candidates still apply. A lot of the time I choose not to apply for roles without posted salaries, because there's a good chance I'm either over- or under-qualified for the role. Applying to a job takes time and effort to do properly (and it's worth doing properly).

As other people have said, you can post a range rather than a single number, and that number doesn't have to be 100% ironclad - if a range is 5-10% out for me, I'd probably still apply and try to negotiate - but I'm not going to waste my time applying for jobs only to find out they're offering £50k if I want £100k.

Check out the jobs posted here: http://oxfordknight.co.uk/jobs/

They all have salary ranges, many are quite broad, but it communicates quite clearly the level that both parties should be thinking about when entering into negotiations. So much more useful.