i have an 04 mk1 vrs. As above , does it have parking sensors ?

If there are four little circles in your rear bumper just underneath the bump strip, yes. If not, no. You should also note an obvious beep, every time you select reverse.

there is no beep . will have to check for the circles

They weren't standard on the vRS. Try reversing towards a wall and listening, since some types of aftermarket units don't require the 2 or 4 sensor blisters described above.

They weren't standard on the vRS. Try reversing towards a wall and listening, since some types of aftermarket units don't require the 2 or 4 sensor blisters described above.

... if you hear a crunch instead of a beep, then there are no sensors.

... if you hear a crunch instead of a beep, then there are no sensors.

Then fit a towbar to prevent making such a mistake a second time around