Does the Property Misrepresentation Act apply to internet auction sites?

KMK

I have paid a fee to reserve a property on an internet auction site. It was advertised on Right Move as an internet auction in connection with a local estate agent who carried details in the agency. In the details it was described as having 2 garages, quite a bonus in an area where parking is at a premium. Our surveyor confirmed that he had inspected both garages as part of his survey
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It was only after the survey that we paid the reservation fee and proceeded with the purchase.

My solicitor now informs me that there is only one garage on the land registry. They are busy trying to establish whether the second garage does indeed legally belong to the vendor.

Where would I stand here if the second garage does not belong to the vendor? It was certainly an important factor for deciding to buy the property and reserving it via the internet site.

Should I renegotiate the asking price? If I were to withdraw from the sale because of the misdescription, would I be entitled to a refund of the very hefty reservation fee? I only reserved the property after reading the description on line and in the agents, which may now be inaccurate.