@nickp turns out I'm talking out my ass, his mum still has it. Very similar car.
Going by your description on handling it sounds like your shocks have given up. Quite common for the age of the car. Two options
1) replace like for like (Sachs parts) which by the way are stiff anyway, I've fitted quite a few sets.
2) Buy some BC's and have 30+ settings on each corner till your hearts content.
This will really sort the handling and wobbliness. The front vagueness will most likely be the rear wishbone bush see if its purple or not.
Lee