Try Transfer Wise https://transferwise.com/
I've transferred load with them, never had a problem and fast!

Last transaction I did was started at 8am and the money was in my account by 5pm - that involved a transfer of sterling to them, them doing the exchange and a transfer from them to my Spanish account - I was astounded at the speed it all went through. None of the transfers were special paid for express, just normal on-line banking transfers.