Sowing sprouts

in Fruit & veg
I've forgotten to sow my sprout seeds (Groninger) - I think the end of April is the latest time. Am I too late or could I get them started now in a cold frame? Its still very cold here in SW Scotland. I'd welcome advice please. Thanks
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
best wishes to you both
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.