I’ve a R reg polo so same shape as yours, can’t help you with the running bit but the bonnet is problematic on mine.
When you said you have put GT85 on it, do you mean on the bonnet or the pull inside the car ?
The bonnet will be jammed above the grill I reckon. If it helps, the grill is in effectively 3 parts, the main part that goes under the headlights, the actual black plastic grill, and the badge.
The VW badge can be gently prised out as it only has 3 push clips holding it in which will then allow you to put GT85 up to the bonnet catch. Than you can try pulling the cable from that end using long nosed bent pliers, or something with a hook on.
When you get the bonnet up, put plenty grease on the catch above the grill as mine sticks if it dries up.
If none of the above helps go on. http://www.clubpolo.co.uk and you will get help on there.