Winter (Jan - April) flowering perennials

I'm starting to think about the winter months and having another stab at a start of the year all white garden. Not loads of flowers, just little pockets of bright white. Keeping it simple as the summer planting is quite complicated.

I was thinking of snowdrops, white Fritillaria meleagris, Helleborus niger, white cyclamen coum and tulip green star. Oh, and some peas (Meteor) to give a sweet pea look but with an early veggie harvest

Do they all sound reasonable as some small perennial plants for minimum fuss, that don't mind being covered over once the summer plants all start growing up around them?

I do have a Cornus kousa var chinensis and a Philadelphus Mrs E L Robinson but they flower slightly too late in June so I'm considering removing them / giving them away. to be replaced by... something that flowers in early April.

Any ideas much appreciated! :D

 

There's also white crocus Jack.

A few shrubs I've come up with.

Exochorda (I know Armandii and Shiney have this)
Hebe
Choisya 'White Dazzler'
Azalea

 

Thanks shiney! So much to investigate that Hellebore is stunning


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You can also get a white Grape Hyacinth Jack.