Hi there,
I have just found a lovely online nursery and wanted to share. (hope that's ok - I have no vested interest in them!)
I usually use Crocus for my plants, and sometimes will use Marshalls or Thompson and Morgan, or the Secret Gardening club. (I do also buy from Great Dixter and Beth Chatto who are excellent too).
I have recently discovered a wonderful place called Ballyroberts who are based in NI. I am in London, so not local to me at all, but the plants arrived 4 days after ordering (only P+P £3.99 for 4 plants), and they are in wonderful condition. (they also sent me a chocolate).
You knowledgeable types probably know about them already, but I was so delighted with them I thought I'd share.