I found this report, and although it's US based there are some really interesting points made. And I always look to data to evidence findings and there is lots of insight in here - because without insight data is really just numbers.
I've posted a few times around how important copy is, that when you make a relatively small change to even a job title it can have a huge impact on the numbers you attract.
Sometimes as recruitment professionals we need to take a step back to see the wood from the trees. Challenge yourself and others. Take a look at the link below and take that step to make some improvements, a little time invested in your job advert will be paid back in multiples.
Keep your job descriptions concise, while still offering enough information about the position. Emphasize exciting benefits offered and provide honest detail about what it’s like to work at your company