Helping young relative to buy their first property. My advice has been to wait a couple of years but he is keen to get on with his life and wants to spend around £400k in zone 2/3 NW London. What data should he be looking at for comparables? eg almost ignoring "for sale" prices and then looking what has been paid since April 2017 for similar --- and going in 10-20% below that. Or maybe looking at properties that have been on for a long time - or just those that are "accurately" priced now? Or go to auctions? I know none of us have a crystal ball but just trying to understand how to approach this so that they dont get their fingers badly burnt first time around.