Posted: 02/05/2014 at 13:51
Hate to rain on your parade Lesley, but they're pretty soul destroying to try and get rid of by hand if they've got the upper hand. The runners will spread rapidly into surrounding areas and it won't help any plants you have either.
If I was you, I'd use a weed and feed product for your grass which will get rid of all weeds and encourage the grass. Healthy grass will be better able to fight off infestations and regular mowing will then keep the grass in good nick. If you want the grass to look good it's either blood sweat and tears to dig them out or use something initially to get rid of them and then maintain the grass to keep on top of them.