Rishworth are the same. All they do is forward on information from the company when I have a problem.
I fail to see why they are there in the first place. 
I believe I know the reason for crewing companies to exist and certain airlines to use them.
Any airline could employ you on a contract directly with the option to lay you off on one month notice (as was rishworths contract) or three months notice.
I applied to the airline the same time I applied to rishworth. I was employed by rishworth for one year then employed by the airline directly. The rishworth step was completely unnecessary, (except to line the pockets of others).