I've done it in such a way that there's no modifications to the main shell of the car. The windscreen looks a bit different as I've shortened the bonnet and put a more modern surround around the screen.
Basically the idea is to modernise the car with styling updates that can be simply fitted onto the car by anyone and where possible retain most of the expensive bits such that it's effectively just a body kit. The bumpers on my car were of the last update to the Mk2 which simply didn't tie in front and rear, they looked like they had been done by different people. So I took the Gold as a reference and tried to maintain a Midas "corporate style"
I certainly had quite a few people pulling up alongside me on the motorways as I trailered the car to and from the show. Don't know if it's made AutoExpress yet though

Plenty more work to do on it yet though. I've made a few tweaks here and there since the show already