You can take the mounts off your existing bumper. You need the wheel arch liner extensions to fill the gap where the bumper is wider, they're about £30 from vw. The fibreglass ones on ebay aren't great.. the replica ABS plastic ones are a little better but nothing like the quality of a genuine one.
From VW a genuine one in primer with the 3 grill pieces comes to just shy of £460 including the VAT. I dont think that's too bad considering 2nd hand genuine ones fetch near £400 on ebay still, without the grill pieces.