The Astras are tough old boots. I always preferred them to the Fucus as police cars. The Foci was a little livelier, a little better on the steering, but they were hideously unreliable in the police environment where wear and tear are reckoned to be up to 20 times that of a regular car.
Conversely, the Astras were a touch steadier and more predictable on the edge and took some hideous punishment without breaking, although I did have one who's gear linkage broke while I was in the middle of a 3 point turn and I ended up blocking a major road in Northampton for an hour while awaiting recovery. I was a popular boy with the locals that day.
The model G astra was my fave. Steady and very safe handling , and the fuel pump on the 1.7 diesel could easily be turned up to give another 15bhp and make them really fly. KX53OHC, where are you now?