Sorry but the polling in 1992 was marginal at best, much like Remain, they took a 2pt lead in the polls and celebrated before the result.
btw Remain lost because they had no one of any charisma, Leave had Boris & Farage, with Cummings in the background, just seems like an attempt to blame Lab for Brexit? which is 110% on the Tories.
Labour don't fuck up, they were never going to win in 2015, no one predicted them to win, the press did for Milliband, remember the hamburger? they made him a laughing stock in peoples minds.
I wasn't a fan of his but Corbyn did well in 2017, all things considered, May was predicted to increase the Tories majority, Corbyn wiped it out.
Tories are successful because they have the printed press on their side, note Labour haven't won in recent years against a hostile press, Blair had the Murdoch's on his side and where we do agree, will (sometimes) be ruthless, whether they will dump Sunak is another matter, hopefully they will, shoe horning in Braverman or Badenoch, the far right will never vote for either of them, just as they don't support Sunak.