This is a bit odd in the estate agent's blurb:
You get to buy properties with a mortgage which are normally reserved for cash-rich investors and cash buyers and you get the security of an exclusive buying transaction with a much smaller deposit
That and the "3 generous sized bedrooms" that are 2m wide makes me think that the estate agents are pretty dodgy, if not the property. I'm pretty sure that that description is against the Consumer Protection from Unfair Trading Regulations.
They seem to specialise in 30 day auctions. I would guess that if the "offers over £70k" price is below market value, the property will go for more by the end of the auction. He will end up in a bidding war.