Biodiversity Policy UK and EU: Invasive alien species
The UK parliament's Environmental Audit Committee produced a report on 16 April 2014 on Invasive Non-Native Species - it's a fair overview of the current situation in the UK and was prompted by the drafting and development of EU regulation on invasive alien species. The EU measures are still in process and include the use of lists of invasive organisms that are common priorities across the EU.
update June 2014: the Government response to the EAC report has been published also.