Charlock Docks , no Clover in grass seeds , was it Hurler and MCPA what was the rate ?If you are going to do them with a knapsack I would use grazon as it is far more potent than MCPA though I admit it is more expensive. But if you're spending the time to do them by hand I'd make it stick.
Thanks yes, your a starYou mean a new ley?
Check the label for maximum doses but from memory I think I used to use around about 1L hurler and 2.5ishL of Polo on new leys. Small weeds from seed you don't need much more than a half dose of each.