I know this was posted at £29.99 at one store in a deal however this offer is National and available from all stores with remaining stock. At least 3 stores in my area had them..
Currently listed between £90-£100 on most other sites including Screwfix so £52.99 isn't bad for a National offer.
PIR movement detector x 2
Installation guide DVD
12m PIR Detection Range at 90° angle
2 door/window contacts
Keypad can be carried around the home for flexibility
20 second exit/entry period
30 metre wireless range
Compatible with full Yale 6000 series alarm range