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the varieties you listed are all good "doers" for me so nothing to be horrified about, I started out with several of those and now have hundreds
I like the sound of your serpentine maze - for extra winter interest, might you not fit in some things other than holly ? Sarcococca, Mahonia, Chimonanthus, Viburnum for instance?
A good place to start might be with this topic...
I would always buy 1 of 4 different varieties (rather than 4 of one variety) ... some may well fare better in your particular soil/situation than others.
my only worry would be how much winter sun the snowdrops would get
the snowdrops will not be very happy under an evergreen hedgerow
raised veg plots with something to shade them in the summer would be a much better bet
The Snowdrops I planted last Spring are in a walk at the back of that copse, so I'll be able to see how they do this Spring - they are just coming up now. The planted area is on the left of this picture (taken facing West):
if you're on clay soil like me the sides of those raised areas will be ideal to give them a little extra drainage, mine thrive on banks here.
Plus less bending down to look at them so easier on the back
The trees in that copse looks like a nice area to me if you are able to dig there?