Hire local or exceptional
£25 an hour is slave labor for any quality IT staff. I don't know what kind of IT staff you're hiring, but if you want cheap assed labor willing to work for what you're willing to pay, then I promise you that you'll need twice or thrice the number of IT workers which will cost you a hell of a lot more even if you're picking them out of soup kitchens.
Be more selective about who you hire and get less people who are more qualified and more dependable.
£25 an hour... wow... that's barely more than McDonalds pays for the guys flipping burgers here in Norway.