Unit 1: The PED for plastic bags in Wales

An interesting post from tutor2u on the impact of a 5p per bag charge on non-reusable plastic bags in Wales

http://www.tutor2u.net/blog/index.php/economics/comments/unit-1-micro-welsh-plastic-bag-charge-reduces-demand?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+economics_news+%28tutor2u+Economics+Blog%29#When:06:49:27Z

a) To what extent does the demand for plastic bags in Wales appear to be price elastic?
b) Given this data, comment on whether the policy should be extended to the rest of the UK