A similar thing happened to me about 10 years ago. I visited my daughter in my Renault master van. After about half an hour my daughter looked out of the window and asked "where is your van?" I jumped up and stared at the empty space where I had parked it. We ran outside and looked around, it was down the hill. It had rolled backwards about 300 yds and come to a halt right in the middle of a crossroads. The road levelled off slightly at the crossroads, before dropping downhill again to a t junction with a very busy road with a 50 mph limit 
As the road had levelled out a bit the handbrake must have been just enough to bring it to a halt. But there it was, right in the middle of a crossroads, with cars driving around it. As I walked towards it, I observed the strange looks drivers were giving it. I waited till nobody was around before jumping in and driving it back to my daughter's house lol. 
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Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual)
160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control.
BORN
Tuesday, 5th October 2004 @ 12:35:52
This vehicle was the 104,679th 75 to run off the production line, out of 112,381
This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744
This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s
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