Vietnamese Mint

With the weather warming up, Holly has been getting her herb seedlings going. Last year we had a fantastic crop of chives, basil and oregano. Considering the small space available (one window sill) we had an incredible crop. The basil variety, in particular, was fantastic with massive leaves from a relatively small plant.

This year we want to grow Vietnamese Mint (also known as Vietnamese Coriander. You can find the fresh herb in most greengrocers in Sydney, but I have yet to see it anywhere here in the UK. It's absolutely vital for Vietnamese cold rolls (goi cuon) and works well in stir fries. It's mildly minty and quite spicy.

So I figure we can grow this through the Summer here in London if only I could find some seeds. No luck with a solid hunt around the net. Any ideas? Even importing them would be okay.