Do I net my brussels??

Absolutely.. unless you'd like them attacked by the damn cabbage whites....

You must net and PDQ else either the cabbage whites or the Pigeons will ruin them literally overnight.

I have enviromesh which ought to keep everything of munching ability out, but something has got in  I think laid eggs while I was weeding & my back turned for a few moments, so need to do a caterpillar hunt hopefully tomorrow.....

May have to nip to DIY store tomorrow lunch as can only find it online far away! eeeeek!

not only cabbage whites but pigeon looking vultures will desicmate your sprouts in no time so i put debris netting over mine 

I went today and they had been nibbled 

luckily not too badly, but have put our polytunnel over them and secured down the edges for the moment until the net arrives- fingers crossed!! Luckily i do have 4 more in the greenhouse as I haven't quite got the nack of sowing the right number yet 

I did the same as you last year. Put down nine shop bought sprout seedlings and didn't know to cover immediately. Returned the next night to find they'd been devastated by pidgeons. I decided to replace all but a three of them ('cos I had some left over anyway) but I really didn't need to bother. They all came good in the end. I understand that the centre part would need to be completely eaten away for the plant not to come good.

So if yours are 'not too bad' as you say, you've got away with it.