Asda Index card holder with 80 lined index (record) cards. Also includes 5 transparent dividers.
The holder is plastic, comes in several different colours (I saw green, red, navy blue and black), has a plastic pocket inside the front cover, is a 2-ring binder and fastens with a popper.
The cards are lined, prepunched and seem a reasonable thickness for the price.
Had been looking for an index card holder / folder everywhere online, and couldn't find anything suitable, but found this instore at Brighton Marina and it's perfect - and cheap!
No idea if it's local or national.