Polish comeback from the UK

This year from the UK and Ireland may comeback twice as many Polish emigrants as the last year.
For the last several months British media mention with worries that Polish emigrants start coming back home, which means, that it will be more difficult on British Isles to find cheap and qualified workers.
The experts underline that there is no clear data about Polish migrants. So which circumstantial evidences do they follow? From analysis of WRS (Working Registration Scheme), an obligatory working registration system, it results that in the third quarter of 2007 in Great Britain only 38 thousand of Polish were registered. It is the fewest since May 2004, which means that the amount of arrivals has considerably decreased.
The willingness of comeback claim 12% of researched people ( in 2007 only 6%). However still three-quarter of researched is not going to to comeback to their country within the next 12 months and 50 % - within the next few years.