European permanent salaries have been coming down. UK contractors take home less now than they did 5 years ago due to taxation changes (IR35). The tax changes have also made the market a bit strange where rates are still advertised at £500 a day even though, contractor takes home significantly less money. These have not gone up inline.
The way I've seen this go with companies that care about their contractor workforce is that assignments and their working practices are thoroughly checked to ensure they remain outside IR35, so the take-home is just as good as it used to be.
Some contracts I've seen involve a liability shift clause from the agency/client to the contractor's Ltd co - and the client will often insist that you have fee-payer/agency IR35 insurance in place to protect the supply chain (Kingsbridge sell this sort of product) if such a clause is in place.
You need to be in an in-demand role and present enough value to be able to demand this though and avoid blanket 'inside' determinations.
Of course, if you continue supplying small companies, it remains the contractor's liability.