I am very keen to trace this vehicle and would appeal to anyone with information to give my team a call.
Did you see the car in the area of the murder at around midnight on Saturday into Sunday (30 December)?
If you believe you may have seen this car anywhere subsequently, I would also urge you to get in touch as soon as possible.
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The property developer painted the mews house in March last year after she was denied permission for a basement below the property.
Profits at the estate agent plummeted 42% in the first half of the year.
Ionut Gheorghe, 27, was detained in Los Molinos near Madrid on Friday by Spanish police under a European Arrest Warrant.