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Most birds grow new plumage twice per year. Read more about this here:
https://en.wikipedia.org/wiki/Plumage

Thank you very much for your reply and the attached information.cheers mike

Plumage
Plumage (Latin: plūma "feather") refers both to the layer of feathers that cover a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, there can be different colour morphs. The placement of feathers on a bird is not haphazard, but rather emerge in organized, overlapping rows and groups, and these feather tracts are known by standardized names.Most birds moult twice a year, resulting in a breeding or nuptial plumage and a basic plumage.

I think that these grow back within 2 months or so it seems, at least until they are functional again. Just the flight feathers is all that you need to trim, and some people even only get one wing, but we like to trim both.