They're ATE and if Halfords couldn't tell you that from the year and model, I'd go somewhere else for the pads. I wouldn't buy Halfords own-brand pads, either. I believe they sell Ferodo so if you're getting them from Halfords, buy those. It's not worth skimping and you'd be amazed at the difference in performance that different pads or discs can make.
Bear in mind I recently bought a genuine set from a Saab dealer for around £35 inc. VAT.