Orphaned mallards

Long story short, we have 3, orphaned mallards. Mum and rest of brood scared off by neighbours cat and never returned. Local rescue said to let them go and 'leave it to nature'. RSPCA said they could only take them at their site 4hrs round trip away! (We don't even live remotely!)
A week on, they are happy underneath their warm brooder tray, we have duckling crumbs, leafy treats, water etc. I kept ducks years ago, so have some experience. As they get bigger, we plan to move them to an outdoor pen.
I cannot find anything online for advice. Am I legally allowed to raise wild mallards like this or am I supposed to have a license? Will they actually fly off when they get old enough? Which I want them to do! Any advice appreciated.
A week on, they are happy underneath their warm brooder tray, we have duckling crumbs, leafy treats, water etc. I kept ducks years ago, so have some experience. As they get bigger, we plan to move them to an outdoor pen.
I cannot find anything online for advice. Am I legally allowed to raise wild mallards like this or am I supposed to have a license? Will they actually fly off when they get old enough? Which I want them to do! Any advice appreciated.
Coastal Suffolk/Essex Border- Clay soil
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They all seemed quite capable of surviving in the wild, despite being raised on an unenlightened 70’s diet of sliced white bread and some of the chickens corn. I’m sure there is lots more information on how they should be raised these days, including I imagine minimising human contact. But my point is I guess, I’d would just do the best you can and I think as long as you get them past the very young stage they will probably be ok
Cambridgeshire/Norfolk border.