A couple struggling to sell their house in a village threatened by airport expansion fear the only option left will cost them thousands of pounds.
Alvin and Sandra Parmar live in Sipson but also own Mrs Parmar's old home, in Sipson Road, which is often rented out.
They have been trying to sell since March but, after having no luck with estate agents or auction houses, decided to see if the owner of Heathrow Airport, BAA, would be interested.
Mrs Parmar said: "I phoned them up but they said because there has still not been a decision by the Government on plans for a third runway they are not buying any property at present."
In 2005, BAA launched the Property Market Support Bond Scheme, to make sure residents trying to buy or sell can do so at market rates, despite the threat of expansion.
"It was also intended to help people sell to BAA if it makes a planning application for a new runway.
Mrs Parmar, who has a bond on both her own house and the one for sale, asked about this scheme and was told as she has a second mortgage the bond for the Sipson Road property was worthless.
She said: "I was angry as I did not know this at the time and now it seems when the time comes BAA does want the house, they won't have to pay a fair rate on it.
"My husband is out of work at the moment, no-one is renting the property and I am stuck paying two mort-gages and two lots of council tax, as well as double sets of utility bills.
"I don't know where we go from here and would welcome some advice as I can't see the house selling in the current climate and also the fact we are blighted by the airport."
Councillor Paul Buttivant (Con), who represents Heathrow Villages, agrees the situation double home owners find themselves in is not a fair one but fears there is little that can be done.
He said: "The BAA bond deal is one which looks good on the face of it but not so great when you start sifting through it.
"Having said that, it is certainly better than what would happen if the Government decided to just compulsory purchase the whole area."
A BAA spokesman said: "In general, residents are able to exercise BAA
Heathrow's Property Market Support Bond on their primary UK property, and this is explained clearly in the application form sent to all eligible properties.
"Residents applying for further bonds on subsequent properties will need to choose which one to exercise, or can sell the subsequent properties with bond attached.
"We do not believe that the property market in Sipson is any different to that in the rest of the country, and recent troubles nationwide are well documented."