That peice is from 2009 , the dog control bill hasnt been passed as law yet ,
This is an extract from the amended dog control bill & it looks like the microchipping will only be insisted upon if you have a control notice slapped on you
Content of dog control notice
(1) A dog control notice shall require—
(a) that the person responsible (“P”)—
(i) complies with the terms of the notice to the satisfaction of the
local authority which has the duty of monitoring its
effectiveness and enforcing it, and
(ii) on changing name, address or phone number, notifies the
authority of