By Laura McGuire According to the latest report from Zoopla, property sellers in London have been shaving as much as £19,500 off asking prices to secure a sale, which could be a warning sign for house prices in the capital. In London, sellers accepted an average discount from the asking price of 4.6 per cent in March, although better than the 6.1 per cent recorded in November, the persistent discount showed confidence has been slow to return to the capital’s property market. However, the property website also said supply in London has grown, with an eight per cent increase noted in the number …