Understanding Society User Support

Dear Sir or Madam,

I am performing panel analyses that (1) combine the BHPS and Understanding Society and (2) include variables about the parliamentary constituencies of the respondents. I have downloaded the parliamentary constituency data for the BHPS and Understanding Society but it appears that all 21 waves of the parliamentary data refer to the 2010 constituencies despite the frequent redrawing of the boundaries. This makes the parliamentary constituency data for before 2010 (wave 2 of the Understanding Society panel) inaccurate. Is there accurate data that refers to the contemporary parlaimentary constituencies?