I took a test just now it was from a pack of two from Tesco's (£3.50 one) a couple of months ago, I didn't want my two children coming across it so I chucked the box and put the spare test in my bedside draw. I'm about a week late but had a crazy run up to Christmas which included me being in hospital for a couple of days.
So the test has a clear line in each window, but no cross at all........ Anyone taken one of these resent key that can help??