We are hoping to buy the property we are renting - the landlord is wanting to sell to us and they are arranging to have the property valued by 3 local estate agents. However, we have just sold another property in the same area and all the agents overvalued the property by between 10-25k (presumably to get our business). What's the best way to get a valuation without it being inflated? We will need a mortgage so should we have a mortgage valuation as well and compare this to the estate agents?