I was going to say "White Nancy" til I saw the deep pinky-purple flower! Maybe Lamium maculatum 'Purple Dragon'?

All the lamiums are happy in shade or semi shade but they are a tolerant bunch so put it where you think it would look nice and see how it goes.

It is a very pretty one and sorry dont know its name but they are very undemanding plants. pale leafed forms will need more light.

beacon silver :)

It will spread a lot once it gets established so give it plenty of room, Scottish. I planted mine in between some roses and small azalias, and it rampaged through the lot of them, pushing stems up to about 2 ft. high! I've had to pull a lot of it out to stop it swamping the other plants, but it's in good soil. I should think it would stay quite manageable in poor soil. Annie (Cumbria)

Thanks for all you help guys. It will certainly be staying where it is for now then, as I have a large area to fill out. I rather like the look of it and since it was a gift - it didn't cost me a thing.