Is there a Walmart in England?

yes there it but it is not named wal mart

Wal mart purchased ASDA in 1999 and kept the ASDA brand for the time being. Asda expanded into Northern Ireland by purchasing 12 Safeway stores. They have no stores in the Republic of Ireland but On 4 November 2008, rumours emerged that the supermarket chain was on the verge of taking over Dunnes Stores.