It is a Hosta of some description.

Thanks for prompt reply!
I haven't got much of clue about plants but I know what looks nice, now you,ve given me that info. i'm off out to get some.Cheers :-)

Dane - they don't all like full sun - make sure you read the labels! Some prefer part shade, and wouldn't thrive in sun.

Certainly a Hosta (common name plantain lilly) but not sure of variety, requires shade, moisture and rich soil, protection from slugs if you don't want it to look like a lace curtain.
Propagate by division in late winter early spring

Shush, Spritzhenry, plants don't read labels or books and Dane has said that this one has lived like this for several years. lol.

It looks quite like the hosta "Patriot" to me as I have one and it looks the same unfurling. Another hosta very similar to Patriot is the hosta "Minuteman" although I think Minuteman has slightly less white than the one in your picture . There are so many hosta types there are probably others it could be.

Both these varieties have a very strong contrast of white against the strong green of the leaves.

Patriot looks like this when unfurled :

http://www.mailorderplants4me.com/products/537

My secret weapon against slugs is to keep the hosta in water all year round. Mine has been on a small shelf in my pond all winter and the shoots are coming up as normal. I still get the odd snail on it later on in the season as they manage ot climb up grass at the water's edge and slither over, but it works well compared to when I have tried putting them in the ground, or in a pot.

Thanks to everyone who has contributed answers and advice. Very much appreciated.
When I say I have little knowledge about plants and stuff, I really do mean "little"!
The reason I like this plant is because it seems to "do its own thing" year after year in the same pots (I have 3 in total) and all I ever do is water them occasionally. Hence the reason for wanting more :-)
When you say "propagate by division" what exactly does that mean??
Told you I don't know much!!!