It's really difficult to say, as it can vary so much from house to house.
Is it in one of the Drumsagard / Newton Farm estates?
What is the selling price at? Is it offers over? The for sale price is usually a better guide than the home report value, but if it's offers over, the sellers could be expecting anything up to another £20,000 or more on top. What was it previously sold for?
I would also look at sold prices to see what nearby houses that are similar size / style / street are going for.
Sometimes, speaking to the sellers estate agent to ask them to indicate a realistic amount the sellers would accept is worth doing, but they might keep their cards close to their chest - it can depend on their circumstances too - if they've found a house to buy already, how much of a rush are they in to move, will it go to closing date etc., has there been much interest in the house, how long has it been for sale for etc - the estate agents might be able to advise.
Ultimately, it depends on how much you want the house and are prepared to pay for it.