In English league football (including the EFL Championship where Blackburn and Ipswich are now), the rules are pretty clear when a match is abandoned:
The result at the time of abandonment does not stand – unless the league specifically rules otherwise (very rare, usually only if the game is abandoned extremely late, e.g. after 90 mins + injury time).
The game is usually replayed in full, starting 0–0, with both sides having 11 players available again.
Any goals, cards, and the match situation at the time of abandonment are wiped from the official record.
So in your example:
Blackburn’s 1–0 lead wouldn’t count.
Ipswich would not have to finish with 10 men.
The game would be rescheduled and played again in its entirety.
👉 The only exception would be if the EFL or FA chose to let the score stand (e.g. if it was abandoned extremely late and the outcome was effectively decided), but 80 minutes is still short of that threshold — so almost certainly, it would be a full replay.