The wreckage of Brexit is all around us. How long can our politicians indulge in denial? | John Harris

If both parties ignore the uncomfortable facts, politics will be flooded with dangerous conspiracies and betrayal myths

This year will mark the 50th anniversary of a musical masterpiece that continues to speak illuminating truths about the impossibility of the human condition, and how people from these islands tend to cope with it. Pink Floyd's The Dark Side Of The Moon was released in March 1973, as the last traces of postwar optimism gave way to mounting economic strife and international tension. The response it offered was twofold: a call to empathy and mutual understanding, and the pointing-out of a national trait that this writer - among many others - has probably quoted far too much. It comes nearly six minutes into a song simply called Time: Hanging on in quiet desperation is the English way."

As a new political year begins, those nine words seem more apposite than ever, and they snugly fit one defining fact of our national predicament: that the wreckage of Brexit is all around us but our politicians will still not acknowledge it. The evidence now encompasses reduced trade, diminished investment and the fact that the UK has been the only major economy not to have returned to its pre-pandemic size. Brexit has resulted in a hit to tax revenues estimated at an annual 40bn - enough to have prevented 75% of the spending cuts and tax rises that were announced in November.