In what it describes as a "plausible" scenario, the bank said the British economy will be 30% smaller at the end of the first half of the year than it was at the start of it, with the second quarter seeing a 25% slump alone following a 3% decline in the first.
Unemployment is projected to more than double to around 9%, but that figure does not include the 6 million workers who have been retained by firms as part of a scheme that sees the government pay up to 80% of salaries. Many of those people furloughed may end up losing their jobs if the economy fails to recover as anticipated or the government starts withdrawing its support too soon.
The bank said the economy should start to recover during the second half of the year as the lockdown restrictions start to be lifted and the extraordinary fiscal and monetary policy measures enacted over the past couple of months begin to have effect.
"We expect the recovery of the economy to happen over time, although much more rapidly than the pullback from the global financial crisis," said Governor Andrew Bailey.
"We expect that there will be some longer-term damage to the capacity of the economy, but in this scenario we judge these effects to be relatively small." The bank expects the economy will contract by 14% this year.
According to its own statistics, that would be the biggest annual rate of decline since 1706 when all of Europe's main powers were embroiled in a devastating war following the death of the childless Charles II of Spain. Ultimately, the war - dubbed by many historians as 'the first world war' - cemented the newly formed U.K's maritime power, which proved to be the base of its economic might over the following two centuries.
The scale of the recession now is markedly more than anything seen in the aftermath of World War I, when the British economy was also laid low by the Spanish flu pandemic. The projected fall is also three times greater than the recession of 2008-9 during the global financial crisis.
Over the longer term, the bank thinks the British economy could revive quickly if the pandemic comes under control globally. Under this scenario, it estimates that the economy could grow by 15% next year, which would be the biggest annual increase since 1704.
In fact, the bank expects the economy to be more or less back to where it was by the end of 2021, with the financial sector helping the corporate sector get through the strain - in contrast to the aftermath of the financial crisis, when many banks had collapsed.
How the economy does depends also on how long the lockdown restrictions remain in place. The bank has assumed that both the furlough scheme and social distancing guidelines will be phased out between June and the end of the year. It has meanwhile not factored in a second wave of infections. (AP) NSA