i am not sure about that particular model- however, i do know about some cars here in the states a few years back that were like that. i used to work in a car audio shop- i remember there was a kit that relocated the current radio (into trunk/hatch or behind a panel) then gave the standard car audio plugs out to plug in a new deck. then there was a seperate dash piece you had to buy that looked exactly like the current dash piece- but with a DIN cutout. i think they were buicks and some fords as well. perhaps there's a relocation kit for yours?
here in the us, there's crutchfield that gives an online application guide for each car. maybe there's a comparable uk site? there's gotta be something!