basically any good growing compost will do, especially indoors. so all of the garden centres, DIY etc
I was thinking more along the lines of additives to give the required amount of each fert 15.15.30. etc Nick
Miracle gro outdoor plant food? there are some specialist ferts you can buy, but i very much doubt they will have any significant increases in either yield or quality. But they will have a much higher price tag! Look at www.growell.co.uk