Actually, what I think I was looking for was "observations", oppositions is for other parties with standing (eg other traders, other trade mark owners) I think.

Actually, what I think I was looking for was "observations", oppositions is for other parties with standing (eg other traders, other trade mark owners) I think. Whilst observations, also part of the adversarial processing, https://guidelines.euipo.europa.eu/1803468/1786255/trade-mark-guidelines/4-6-observations-by-third-parties https://guidelines.euipo.europa.eu/1803468/1786255/trade-mar..., are for third parties. Opposition has a fee, and it's probably not appropriate for me personally to be involved (I work in IP, not in TMs). Maybe I'll look at anonymous submissions under Art.5 EUTMR. (That link says it is obsolete, I'm assuming that the procedure has just been updated.)