Thanks Goodlife, I'll take a look at the link. I wasn't sure if it is because they are an F1 plant or just as it's new they are only releasing plants/plug plants.
I've got a small plant I overwintered from last year, it looks to be sprouting and I noticed quite a few seedlings germinating on the surface of the compost. Most look to be weeds but a few might be from Lollipop. Although if they are Verbenas they are likely crossed with the bigger sort which was growing other side of the garden. I was just wondering whether to save seed this year, the butterflies and bees adore them and it would be nice to have more of the short one growing too.