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Hiya,
I have this plant in my garden, it's evergreen, heart type leaves, very hardy, lush green colour all year round, spreads everywhere and also grows in cracks and bits of wall. Think it has a blue flower. Does anyone know what it is please?

I think that it is a Campinella of some kind.

Campanula? It even gets into my drains >:(

Looks like Campanula and if it's coming up in cracks in walls, probably the one that sounds like Porzychyiana.  That's not how it's spelt but I'm at work so can't check what I mean.  it's a rampant little devil but useful for softening concrete paths etc as it recovers from being stood & driven on and survives in all sorts of crevices.

Snails love nesting in it, btw >:(

The leaves do look like C.portenschlagiana, but in our garden it is not evergreen.

Thanyou once again folks ... it is a Campanula portenschlagiana  :D
(Dalmatian Bellflower)

This is the description i found on the search engine ...

Mound-forming, evergreen with heart-shaped, mid-green leaves. Panicles of funnel-shaped deep purple flowers. Height 15cm. Spread 50cm. Flower colour Purple. Flowers from June to August. Evergreen. Foliage colour Green. Hardy. Planting instructions Water thoroughly before planting.

I have this plant.  You can be quite brutal with it and it will still come back again.  Still it is pretty  ;)

Ours has flowered right through the winter - a little carpet of purplish blue at the back door.