Cap on soil

With all the rain this winter my soil has developed quite a hard cap. I am about to mulch with FYM - do i need to break up the cap before I spread the mulch, or will the worms do it for me over time? I have quite a heavy clay soil, and the garden is all on a gentle slope.
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I would run one of the three pronged cultivators around and then mulch.If you don't have one, you could use a hand fork or even a hoe.
Or a rake?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
It depends on how much space is between your plants. Mine won't have any gaps until I pull out the forget me nots. If I learnt how a hoe, I wouldn't have all the forget me nots or poppies, or all the overwintered cerinthe that are just starting to flower.
Thanks - i have a hand fork on a long handle (if you see what i mean) - i will do some serious tickling of the surface before i add the fym
Thanks again - will attack some of it today