basil seedligs wont grow
The basil seedlings is about 2cm / 0.78 inches tall and have just 1 pair of real leaves.. it has been exacly like this for approximately 3-4 weeks..
Where I live day-temperature is maybe 8°C and we dont get alot of sun, but it stays in the windowsill..
why wont it grow any taller? 
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Why should it be nice to you if you won't return the favour?
Basil needs sun and warmth. At least 4 to 6 hours of proper sunshine every day. And a minimum temperature, day and night, round about 20°C.
If you live in Derbyshire, as I do.
Sorry I was a bit unclear, - it is living inside my house, in the windowsill with 21°C.
But outside it is not very sunny..
Got any bubble wrap? I tend to sow basil as early as I can because the OH loves cooking with it. I sow it in a pot with a plastic bag for cover and as soon as that comes off the pot gets wrapped up, I make sure it is 3 or 4 inches above the rim of the pot and it goes onto my kitchen windowsill. They don't grow as quickly as later sowing would but they do keep growing and I have some fairly strong seedling by the time they can go outside.
It doesn't do very well outside in this part of the world, in my experience, unless we have an exeptionally clement summer. And windowsills tend not to have enough light, as it only comes from one side.
The most success I've ever had with it was in an unheated greenhouse where I sowed in April and planted in pots in between the tomatoes.
Basil originates from Thailand - so if you provide similar conditions, it'll thrive.
It wont need beautiful palm-fringed beaches or the delicious seafood tho..
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
I grow basil on a kitchen windowsill but I haven't even sown any yet. It really needs to be consistently warm to grow well. Low night time temps will check it.
Make sure you're not over watering it too
I live in west central Scotland - not where that photo is...
This is the stage my seedlings are at, this lot will go into the wall planter by the kitchen door for fresh cooking, I'll sow another lot in the next week or so that will go into pots next to my chilli and tomato plants (along with the odd marigold) as it seems to help with the pest control, the leaves from those will be dried for winter use.