Per Boris Johnson in The Observer – but this isn’t a partisan issue: it’s a national crisis:
The figures are terrifying. In the 20 years from 1985 to 2005, the overall number of entries at A-level rose by about 100,000, from about 680,000 to about 780,000. Yet maths fell from 71,608 to 58,830. Physics A-levels slumped from 46,606 to 28,119. Chemistry fell from 40,337 to 38,851. There are some London boroughs where further maths is virtually extinct.
UPDATE: There’s a good follow-up discussion here.