[LottyLouis]

Hi all
On allotment today and noticed a few broccoli leaves are stripped down to virtual skeletons! Only put the seedlings in yesterday!
Was on allotment all day and as I was leaving, I noticed that several more leaves on other plants are also seriously chomped. No birds were around at all and on inspection - I could see no caterpillars.
Help!

[Aunt Sally]

It will be pigeons !

They will be doing it while you're not around.

Netting will keep them off.

[m1ckz]

yes pigeons it is  you must net them

[mumofstig]

If you don't net it - you don't get it!

The pigeons will get it instead 

[Salmo]

Or could be slugs/snails. If they look as though bits have been cut off it is pigeons. Slugs/snails have rasping mouthparts and the leaves have holes in them, also slime trails.

[Aunt Sally]

It's pigeons!

[Salmo]

It's pigeons!

Without a photo or detailed description how do you know? Probably, yes, but not for sure.

[Aunt Sally]

I'd lay a shilling on it being pigeons. 

Slugs and snails will eat some of the leaf ribs too; pigeons never do.  So, net them and put a few "Growing Success, Advanced Slug Pellets"  around for good measure.