Re:Which probably explains.... (Score 1)

I'm pretty sure the old ones were Dione keypads - they were dark grey, quite blocky in style, and with an old-fashioned looking screen. The keys on them were also really prone to wearing out, especially the zero key for some reason.
These ones - http://www.epos-epos.co.uk/retail_till_systems/chip_and_pin_card_reader_terminals.htm
The new ones are much sleeker looking, but look as though they have equally dodgy keys. I can't find a picture of them though.

As an aside, I was in a Tesco store recently when the staff were going around disconnecting all the chip and pin readers and weighing them. I overheard them chatting at the customer service desk, and they weren't sure why but they were looking for any which didn't weigh the same as the rest.