Gazeal, the new service aimed at preventing fall-throughs, has already signed up estate agents just days after launch.

Founder Duncan Samuel told Eye: “Although we are concentrating on business-to-business marketing at the moment, we have also been approached by members of the public wanting to know more.

“Typically, they tell us they have been gazumped two or three times on a property and are thoroughly fed up, and are keen to stop it happening again.”

The service is free for estate agents to sign up to and is followed by about an hour’s worth of training on the system.

Samuel said: “We have kept this very simple. Our objective is to help estate agents and to work with them.”

Agents are paid a fee of £100 for every successful introduction to Gazeal and Samuel believes that it is agents who will play the greatest role in building customer awareness.

Gazeal works by locking buyer and seller into the deal as soon as it is agreed.

The buyer hands over £250 plus 1% of the agreed sale price. This latter sum is passed to the seller’s solicitor. The seller pays the same sum on completion, when legal fees are settled.

The buyer’s £250 is refundable should it emerge that the property’s title is not “good and marketable” – in other words, the price of the property could be affected.

Samuel said that while problems with titles are commonplace, they are nearly always minor glitches such as an absence of planning permission for a conservatory, which can be sorted out.

“However, something like HS2 coming through the back garden would be far more serious,” he said.

When Eye ran the launch story on Monday, one reader queried how Gazeal would work if an estate agent subsequently received a higher offer which, in law, must be passed on to the vendor.

Samuel said the seller would be unable to accept this: “What we are selling is certainty,” he said. “Gazeal has the same effect as legal exchange.

“Yes, some sellers might be kicking themselves if they were to get a higher offer, and by the same token, buyers might be kicking themselves if it turns out they could have made a lower offer.

“But what the seller has got is a definite buyer, and what the buyer has is a property they’re not going to lose.”

Samuel, a lawyer, said that his first objective is to bed Gazeal in among the initial target audience of first-time buyers, cash purchasers and buyers of new homes – all buyers without chains.

“When we are satisfied that this has been done, we will roll out Gazeal into the rest of the market, where there are chains,” he said.

“I can’t say when this will be but this is a more complicated product. However, it has already been designed.”

Samuel said he accepts that not all agents will want to know about Gazeal. “Some are quite resistant to change,” he said.

Others, however, will embrace it with the benefit of fewer failed transactions.

He said that he will know when Gazeal has succeeded when agents start promoting it on their own websites and adding it to their Rightmove listings.

The site is here