[2007] UKHL 8, House of Lords on 28th February 2007
persons who are not of British origin constitute a racial group within the meaning of the Crime and Disorder Act 1998 s.28(4) hence, reference to "foreigners" would be a reference to such a racial group. The essence of the aggravated offences is the denial of equal respect and dignity to people who are seen as "other".
For relevant general notes see Definitions and interpretation /racial discrimination and/or Definitions and interpretation/racial grounds and/or at Definitions and interpretation/racial group