I have not worked in recruitment; but it seems to be it must be very simple to deal with applications from candidates who are not a good fit. You need a range of rejection automated emails, e.g.
Code 1 - rejection (I'm sorry you do not have the skills - try a dog walking agency)
Code 2 - rejection (You have skills in this are but we are concerned that you lack x, y z)
Code 3 - rejection - you follow my reasoning?
"Considering I am more often than not simply conveying the feelings of my clients" - this I believe is where the industry is falling down - if you client's have requirements that are at odds with the legislation it is for your management to inform them of this and the EE(A)R 2006 makes this very clear.
My issue was recruitment agencies using what other poster have described as "weasel words" to get around the legislation and genuinely rejecting candidates for reasons of age.