An item needs to be marked as collected to update the status of the NHS Voucher for processing. It's good practice to mark all items as collected when the patient collects them. All Sight Test fees are marked as ready to be claimed automatically, but frames and lenses etc., need to be marked as collected on the Till before the money can be claimed.

To mark an item as collected, double-click on the shopping bag towards the top of the Till screen, the button is shown below:

It will ask for a collection date to be entered. 
Once a date has been selected, the check-box will be ticked, and hovering over it will show the collection date.