Pinhead sized cream coloured flies on carrot leaves

[Chef_uk]

handful on each carrot's leaves. Are they the dreaded carrot fly? Maybe slightly bigger than pin head

[Aberdeenplotter]

could well be the willow aphid.

[Two_Sheds]

or baby spiders ... can you post a close-up?

[Chef_uk]

Should have got the picture first lol. Here it is.

[Two_Sheds]

Can't see too well, but the general body shape looks like some kind of aphid

Def. not carrot fly, they look like small houseflies

[rustylady]

Aphids, I think.