Hi Clare,
Had my Sky+HD box & dish fitted last week.All for £30- including installation.
I know that some on this forum have had bad experiences with Sky & the install contractors they employ,but i have to say Francis - the guy who came to install ours couldn't have been more helpfull & patient.
He even ran another cable right around to back of the house,drilled & filled a hole through the wall of the rear-bedroom & hooked-up the redundant standard box to use as a freeview receiver.
BABUR.