My nephew installs satellite and digital terretrial kit for a living and says he gets less grief from Humax than other brands.
Superfi has them at £48.89 atm (+ free delivery).
Obviously dearer than tescos own brand but it does have a 2 year warranty, which may be worth something to you. I got one for my folks, they liked it so much they got a pvr version for their big telly.