I googled this, as I may have a use for it myself. I have no experience with these.
Thanks for your response, much appreciated. I was not aware of the productivecomputing solution. Looks like unless I want to do some coding we may have to change our payment gateway. I'm surprised that there doesn't seem to be an option for Worldpay with any of these. I'll look into the options and if we go down one particular route will post back here with experiences.