Shed rooftop planting
Hi I’m looking for suggestions for what to plant in this, my husband has made this up for me and I would like something pretty to grow. It’s just under 3 inches deep and has waterproof membrane down with a few holes poked in for some drainage. It gets some sunlight but not masses of direct sun.. 

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East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
Saxifrages will also be fine, and things like alpine Phlox and Arabis.
I live in west central Scotland - not where that photo is...