The other thing that's coming is accepting contactless payments on consumer phones with no special hardware needed. I'm not sure who will launch first in Ireland but it might be an interesting alternative. We'll probably start to see it first for food delivery/tipping or courier on delivery fees (it's crazy that UPS turn up and expect cash for import duties!).
Thanks to everyone for their replies.
We have since acquired a couple of SumUp devices and used them in Bucket Shaking Fundraisers - once your bucket shakers know how to operate them (and it's quite simple) they work very well. Upwards off 30% of the donations came by "tapping", and we also reckon they have increased the amount we raised. If somebody wanted to give cash we took it, but if they indicated that they had no cash we offered the option to tap - not everybody accepted it but most people expressed surprise and took the option.