Im sure you can find it somewhere in the UK but you really, really shouldn't. These flimsy aftermarket bumpers just look horrendous, even on jap crap they usually look bad. When you get it painted it won't be quite the right colour, you will catch it on a curb, scratch and crack it, some big screws will be used to screw it back on, then it will deform when driving on the motorway, start flapping at over 40mph and it's highly likely that someone will vandalise your car because of it, people just hate rude boy bumpers and it will halve the value of your car instantly.
There is not one single good reason to start sticking large pieces of crappy plastic to your car. VW's are quality, solidly built cars and should stay that way. OEM+ all the way.
