The Tories strategy has recently been to go for votes in the north of England, as they presume that the south of England outside of major cities is safe Tory territory. Many Labour voters apparently voted Tory in December to get Brexit done and the Tories will be looking for any possible benefit from Brexit.
Offering cheaper imported food, which they may believe will be popular in lower income households, could be seen as a vote winner. The Tories may be presuming that the farming community even though they may be affected by cheaper alternative food, are never going to vote Labour. There may be a belief in Tory minds that they could gain more votes, than they lose.
If Brexit does not meet the aspirations of the millions who voted for it, the main party that advocated it, are going to be in trouble at the next election. A combination of a Covid-19 derived recession and Brexit related problems is not going to help the Tories campaigning to stay in Government.
This is interesting, leading bankers argiung for 'greening' the global economy. They include the current governor of the Bank of England and the previous one.