http://www.dailymail.co.uk/news/arti...-SCRAPPED.html
I think the main reason that people fill jars with them is that many places won't accept more than 20 of them per purchase. Plus banks will only accept 3 or 4 bags of them for deposit, per day. And those Coinstar machines that have appeared in supermarkets take a 9.9% cut.
In the Netherlands in the late 70's we could drop our loose change into a machine that sorted them and packaged them into neat paper tubes. The banks accepted as many of these as you offered. Maybe UK banks should offer the same service?