Perhaps the Nobel prize scientists who discovered the quantum dot could be set to work on detecting an equivalent dot of contrition in Rishi Sunak’s Conservative party conference speech (Key takeaways from Rishi Sunak’s 7,500-word Tory conference speech, 4 October).
John Lowery
London
• It’s odd that the prime minister proposes a ban on smoking “for the nation’s health” while simultaneously encouraging road traffic congestion with its accompanying emissions and pollution.
John Weightman
Ettington, Warwickshire
