Garlic & Onion not sprouting?

in Fruit & veg
Had great success growing Garlic over the last two years and looking back at photos they come through within two weeks.
I planted them this year on the 17th November and 1 has just come through, dug one of each up and both have developed good roots but no growth from top of sets/cloves?
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.