In 1979, Conservative MP John Corrie introduced a private member's bill aiming to restrict abortion rights. In the climate of New Right ascendancy marked in Britain by the election of Margaret Thatcher in that year there were real fears that this would become law and a campaign was launched against the Corrie Bill. The biggest event was a massive demonstration in London in October 1979 called by the Trades Union Congress and the National Abortion Campaign. In the event Corrie did not succeed in getting his bill through parliament and the 1967 Abortion Act remained intact.
Here's extracts from a couple of reports of the demo highlighting the role of (post) punk bands.
Get up, eat my porridge, put on my feminist radical chic (or do I mean my radical feminist chic?), anyway, put on my loud yellow coat, fluorescent socks, sensible shoes etc. etc., select a thoughtful cluster of badges for the occasion and set off. Climb on the bus, discover that all the other passengers are wearing those hideous pink 'March for Abortion Rights October 28' badges too. Meet more of the same at Finsbury Park tube.