Hey guys, just to update you on this. In the end I held out for a genuine GT sport bumper and I'm really glad I did
I started to pick up the pieces individually and I actually paid ali6n2 for a GT centre grill when a complete genuine bumper popped up on ebay with splitter, grills, fogs, and even washer jets! ali6n2 was an absolute gent and offered to refund me the grills since he hadn't shipped them yet. Thanks mate!
It wasn't cheap, but it was genuine, and it's rare that a complete bumper in undamaged condition comes up for sale so I jumped on it. So the bumper arrived in the post last week. It was wrapped in the thinnest bubble wrap you've ever seen and I really didn't have much faith that it would be undamaged. But it was absolutely fine. Phew!
I dropped it off to an paint shop that was recommended by Volkswagen and picked it up this evening. They charged a little extra (€50) to have the bumper trimmed to fit, but it's perfect so I really don't mind. Here it is!
Before:
After: