Cutworms

My sprouts have been nipped off at ground level and as they are netted I suspect cutworm.
Years ago  I used a granule pest killer which was effective but no longer available.
Is there a pesticide that protects from this ?

There are no pesticides for cutworm.

My very simple and 100% effective cure is to slide a twig immediately beside the plant stem so they're touching (but not disturbing the roots) and just into the soil about 1/2". That's it.

Cut worms must touch their nose to their tails, so to speak, to chew and if they can't do that then they can't chew. The twig adds extra thickness to eliminate their chances to do damage. Also furtle about in the soil to see if you can find the little devils.

Some people have slit a short length of plastic straw and slipped it onto the stem and just into the soil. Does the same job but is fiddly to put on without damaging the stem.

The Provado 'Utlimate Fruit & Veg Bug Killer' does say that it will kill 'caterpillars (including cutworm)', however, I've had a good read of the Bayer site and it doesn't say how you're supposed to get it so them and I can't imagine them lining up to be sprayed!    Maybe a drench?