Rather than puttingg farmyard manure on the lotty this backend which I did last year I want to sow mustard seed which I can purchase from our lotty association, any suggestions on when to sow and to rotovate in, :)
Two places that might help are linked below
http://www.rhs.org.uk/advice/profiles0802/green_manure.asp
http://www.greenmanure.co.uk/mustard_white_tilney.htm
Try these to see how you get on.