1. Pernem

MAG held the seat; the winning margin narrowed from 29.8% to 25.1%.

Boundaries were redrawn between 1972 and 1977 — the comparison is matched by name and is indicative only.

• Won on a lower shareIts own vote share fell 11.4% — it held because the rest of the vote was more divided.
• Vote fragmentedThe top two took only 75.5% between them, down from 93.5% — the field split more ways.

Written from the constituency figures by a fixed set of rules — no language model.