Yes I grew mine last year but did ion London too.
Actually still have some in a large flat pot outside kitchen window and they seem to be sprouting again!!
My mistake this time was letting the cats access before they were big enough cos Franta was demolishing the plantlings before they were big enough to resprout.
Good heavens you were studious, I keep my brushes for painting lol, just sprinkle seeds thinely into a seed tray and when big enough transfer them to bigger pots, about 4 to a pot and the let em grow bigger. If you nip off the end of the top shoot it will make more side shoots and then also nip off a few tops of other shoots and that will make them more bushy. When they are about 6 to 9 inches shove em in the ground and watch the cats from miles around be attracted by their perfume
The cats will do the rest of the nipping LOL.
I dont find them hard to grow at all and when it is warmer out there will grow some new ones in the greenhouse and ban the cats till the plants are big enough
I have some pots that are about 20-24 inches across and only stand about 9 inches high and thats where I put my plants for the cats, means I can move em around and rescue them if the cats get too rough