Where's the air bridge to San Serriffe?

In the consideration of larger school protective bubbles, Geoff Barton may be correct that the logistics of keeping children apart will be “mind boggling” (Back to school: what can pupils in England expect from September?, 2 July) but monitoring bubbles could be greatly simplified by the use of different coloured hi-vis waistcoats, which are commonly worn by younger pupils on school trips.
Alan D Connell
Harrogate, North Yorkshire

• It’s not just Contagion that can help us to cope with Covid-19 (I feel fine: fans of world-ending films ‘coping better with pandemic’, 1 July). Turning to literature, there’s not only Camus’s The Plague and Defoe’s A Journal of the Plague Year, but Mary Shelley’s The Last Man (1826), which predicts a 21st-century epidemic, in which everyone dies except the title character.
Michael Bath
Rochester, Kent

• Perhaps there would be room for people on the beaches (Letters, 2 July) if they stood like Antony Gormley’s figures on Crosby Beach, social distancing and facing out to sea.
Jean Jackson
Seer Green, Buckinghamshire

• “I don’t believe in gestures,” says Boris Johnson (Politics live, theguardian.com, 3 July) on why he would not take the knee, not so long after being seen clapping for carers outside No 10.
Jim Golcher
Towcester, Northamptonshire

• I am sure that many older Guardian readers will be sorry to learn that the list of countries we are now allowed to visit does not include San Serriffe.
Cyril Duff
London