My property was bought at a very low price and therefore not reflective of the area, the algorythm Zoopla uses takes into account the last sale price which does not take into account a large investment into bring the property into line with its area... therefore independant agents value my home at £330 - £340K but Zoopla values it at £277K!
This gives misleading data to buyes who place too much trust into Zoopla's flimey calculation formula!.