Lavender haircut in spring??

Hi, I sucessfully sowed Munstead Lavender last yesr, they were not very big when winter arrived and I thought they may die, they are still alive, I added a layer of gravel on the top of their pots and kept my fingers crossed. They are still small but still alive, will I need to give them a haircut in the spring? They are like a little mini bush 

No, English lavenders prefer their haircuts after they have flowered in summer, but don't overdo it or you will finish up with an English skinhead (a dead one too if you cut below any little new green shoots on the woody stems, although that shouldn't be a problem with such a young plant.)

I've grown hundreds of lavenders from seed and have about 100 baby lavenders in the greenhouse now, sown last summer. Mine are still quite small but bushy. I go over them with the scissors when ever they look as if they need it while they are still small. I'll plant them out in the spring and after that  cut them after flowering.

Anything  cut off with the scissors that is a decent length i root as cuttings.

I was worried about trimming because there outside in all this bad weather, they are very tough 

Uuuummm, i see. Looking at your location you would have harsher winters than we get here. Have they got any shelter at all, like from a wall . But if they have been outside all the time, think i would still keep them neat with the scissor treatment until they are out in the open ground,  then go over them with the shears after they flower this year.