quick spud question!

Hi all im a newbie on this so take it easy,I have some pentland javelin spuds growing in bags on the patio i can see some green shoots that look like there forming leaves poking through the soil do i cover these over now or leave them!!

Start to cover them a bit up as they grow through so that a frost doesn't kill the tops.
You can do this a few times until your pots are full up. If it's still frosty then you'll have to fleece them.