Posted: 04/06/2014 at 12:36
Weedkiller and vigilance John seems to be the only way.
Lots of people have had various experience with it - you can use a weed suppressing membrane in 'hard to reach' areas, but it will grow underground and pop up at the edges. I've done this in the past and then kept hoeing it or using strong weedkiller to keep it at bay. In more open areas , plenty of sturdy evergreen ground cover will help a bit and then pulling it out on a regular basis and applying weedkiller several times during the year to keep on top of it. Any bits left in the ground will regrow, so I'm not convinced digging it out can work and takes a lot of effort, but others may say the opposite.
As you say - it's been around a very long time so it knows how to get the upper hand.