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What about some hardy cactus?
Might not get enough sun for C graecum to flower but you could try if they are spare plants. How about experimenting with a range of cyclamen? Cilicium, coum, purpurascens, possibly libanoticum? I'd leave out hederifolium from the mix as it would probably be too vigorous and swamp the others.
Thanks Steve. I think I have one graecum that I could afford to lose so may well try that, but as far as the other suggestions are concerned I haven't enough mature plants to spare although I have seedlings coming on.
David, I think you should consider the 2.2. option again.