, Tesco has a 30.4% share of the UK grocery market while Asda's share is 17.5%, followed by Sainsbury's at 16.1%, and Morrisons at 11.8% [REF].
According to CACI, as of 2006, Asda has market dominance in 14 postcode areas; DY (Dudley), B (Birmingham), CH (Chester), L (Liverpool), WN (Wigan), BL (Bolton), BB (Blackburn), LA (Lancaster), HU (Kingston upon Hull), SR (Sunderland), DH (Durham), NE (Newcastle upon Tyne), G (Glasgow) and AB (Aberdeen) [REF].