sorry if this is DOH

Hi Flitwick.  I'm not an expert on carrots, but I know they don't like being moved, or are you thinking of leaving them to grow in the loo roll inners?  If you are, they'd need to be 1 per loo roll!  I usually sow my carrots directly either into the ground or container, then thin out as necessary.  If they are too close together they won't get very big.

yes very i shall get the scissors out soon thx for the replies

I agree with PAULW, leave them be. Carefully thin them out as baby carrots as they get bigger maybe,but with any luck they will be in the ground and the toilet rolls will have disintegrated by then.
A guy on our lottie who does really well with carrots spreads them thinly in line, never thins as he says attracts  carrot fly and covers with fleece. Lifts and and digs up the biggest bunch of straight tightly packed together gorgeous carrot, envy of everyone!

Timing is everything with the loo roll method, if the tap root goes down and hits the tray like hitting a stone in the soil before you get it in the ground the root will stop growing and the carrot bulks out you can end up with a carrot 2 inch long and 6 inch wide.

i grew them in tubs last year and this year will try both

Catherine how much per seed is that

i would leave  them, but if you're transplanting the tube into the ground (as opposed to insane idea of removing them from the tube), then cut the side of the tube whe nyou put it in.
it'll expand then.
if i sow too thickly, i use the babies that emerge in salads and the ones left will spread out and grow bigger.