[pipfit]

I have access to plenty of sieved top soil what else and quantities would I need to make my own potting composts.Spent a fortune on them last yeay
Thank You

[mumofstig]

Have alook here and see if it helps

http://www.chat.allotment-garden.org/index.php?topic=8533.0

[Salmo]

John Innes formulae see

http://www.northantset.co.uk/ask-nicholas/Many-books-mention-John-Innes.1890804.jp

The peat can of course be replaced with non -peat substitutes.

I presume that your soil is unsteralised and will probably contain weed seeds, also fungi which could give problems with damping off in seed compost.