On the mk2 the 4 bolts that secure the bumper are also securing the front cross member therefore the front engine mount . There are 2x8mm bolts that still secure it when you remove the bumper but I personally wouldn't risk driving it like that .
The only way you could is to remove the 2 bumper brackets from the main bumper and refit them so that can refit the 4 bolts .
But make sure there are no jagged edges exposed and that you have all your indicators and numberplate as Mr Plod may not be too happy if you get stopped.