Not a huge amount Tas, at least not compared with France et al. According to DEFRA June 2007 statistics maize accounts for 130,800ha last year (up 5%). In comparison wheat totals 1,693,000ha, barley (all) 566,400ha, oilseed rape 564,200ha, potatoes 105,300ha, sugar beet 122,200ha, beans 116,000ha, peas...