You can't beat a good reversible hand-embroidered placard.
Brexit threatens to harm the UK space industry. Athough the European Space Agency sits outside the EU, a third of ESA programmes have EU funding. The UK is preparing to shut itself out of those.
The speakers here are a mixed bunch. Protest marches depend on volunteers and donations. But we're trying to look like the top team, not something dumped outside Oxfam in a bin-liner. So can we apply a bit of quality control? Be ruthless about who's allowed to speak. Set time limits. Screen out the ranters and the laboriously unfunny. Jab speakers in the arm with a darning needle if they go on too long. Today an emerging star is Conor McArdle, a twenty-year-old law student from Northern Ireland.