Question Clive.
Pedders No 1 mix has Radish, and Peas in It. and you are following it with Peas and OSR. Are you not concerned with rotation not just for this crop but for the gap you technically need to leave before going back to this field with a Brassica or Legume cash crop? This is my biggest worry with all these covers being grown. I understand people talk of improved biology helping in this regard but this will not be proven for at least a decade, but IMO is a worry until then?
Its my plan to mix either Rye or Oats with a bit of Phacelia/Sunflower/Buckwheat (we need minimum two species here to count as EFA area) before next years no till Peas!
I no longer use #1 mix - that was my first year of cover crop in 2012/13
however I'm not over concerned re rotation gap, if you listen to some CC advocates they suggest same family crop is a good idea to prime appropriate biology for the cash crop
Within reason i'm not actually sure it really matters what the cover contains anymore, what really matters is you keep something growing on land at all times. I used Vetch, pacelia, radish last year and im happy with it, this year I may just use a millet, linseed, pea, bean and lupin mix purely because I can do that from home saved left overs and not spend any cash !