The number of disappointed parents appealing against their child's school allocation is set to top half a million today, according to new estimates. Between 19992000 and 200607 almost 490,000 families lodged appeals, Government statistics analysed by the Liberal Democrats show. This will push past 500,000 when the latest official figures, for 200708, are published today, the party said. Its research reveals that in 200607 alone 57,950 disgruntled parents appealed against a school allocation. Just over a third of these were successful.