I want to colour code all the grills and grey trim on my front and rear bumpers of my Mk6. The rear isn't a problem but the front seems more difficult. Will I need to remove the bumper to separate the trim ??

no need to remove bumper. its a bit fiddly,but they just pop out. theres tabs holding them in,so a flat blade screwdriver helps.

Managed to take the lower grill out of the front bumper but how do I remove the grey surrounding without damaging the paint work or going in from behind it ?

I remember taking mine off to fit the power steering cooler, think I used a long metal rod (read: barbecue utensils) to push in some the clips from the back just to be safe, along with some strategic pulls. I imagine it will pop off with a few pulls in the right places.

Cheers for the advice, I'll give it ago just a little cautious of damaging paint and having to pay for a spray job.