[moneyspider]

Hello,
I have covered my brussels with scaffold netting and there are no gaps.  I have checked my leaves and they have been eaten, badly.  I have put slug pellets down so its not them.  Some leaves have little white circles on them.  What is this? and what is eating them?  How can I stop this.  All my other veg is fine. 
Please help
Moneyspider

[DD.]

I'll move this to GYO where the people in the know are more likely to see it!

[greg.t]

Mine have a few little hole too, thought it might be flea beetle damage...

[Mike.white]

cabbage whites? Look for little yellow eggs under the leaves in a sort of set of snooker balls kind of formation...

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(Erm... kind of like that....)