Hi Yvonne
I drive past it twice a day, the house is most certainly still there, and undergoing huge amounts of work to I believe try to return it to its former state. If you check out house sale prices you will find it was sold for £1.5M in 2004, and since then there have been numerous planning submissions, which you would be able to find using Google and going to Wychavon District Council Planning. Building works have been going on for at least 2 years!
If you use this (put "Hanbury Mount" in the search box), you will be able to find details of the present owner - I won't post them here, but perhaps if you wrote to him he may be able to give you some details if former deeds have survived?
Best of luck, Ian