I was in the Wellingborough Tesco today - pricing errors everywhere and stuff on the wrong shelves but spotted this little gem. It was such a good deal I had to check with a member of staff.
Yes - buy one for £0.62, two for £1.24 or 4 for £2.50
The price was clearly marked on the shelves - 4 for £2.50 or 62p each
So by buying 4 of these you actually pay more - fantastic deal in this credit crunch