05/03/2018 - We have been in contact with SPAR to see if this is a possible function on the self-service tills. They have responded today informing that they are looking into adding this onto the tills in HUU and will be back in touch shortly with a definitive answer.by Osaro Otobo
17/04/2018 - UPDATE
The provider of the self-service tills have recognised this is a function they must incorporate into the software and are now working on including this facility into the tills. I will update this idea again when I hear back from the EPOS provider.