We had this last autumn- saw a property that we were keen to view.
Phoned the EA (Foxtons- now make a point of avoiding all properties on with this agent!) who spent most of the time talking about other properties in the local area.
Arranged a viewing for that weekend- EA said they would call us on the day to give us the exact address/postcode.
Said they couldn't give it to us beforehand as prospective buyers have turned up at properties for sale prior to arranged viewing.
The weekend came, nobody called or emailed. Took ages to speak to someone at the EA- basically nobody knew what was going on.
Made a few more attempts over the next weeks, then the EA admitted that the vendor had already accepted an offer, but was open to viewings for a "better price".
At this point, we told them we'd leave it despite them encouraging us to arrange a viewing.
It's still on the market now, half tempted to ask again to have a first look but we've vowed not to bother with Foxtons- not because of this particular property, just in general don't like their style!