So the results of my not very scientific poll are in. And as of this moment, madrassah has it with 32% of the vote, taking it just ahead of madrasa, with madrassa coming in a close third. Madrasah trailed in a very poor fourth.
And the discussion suggests that pronunciation is the key, with the rather harsh “AH” sound at the end being the closest to the Arabic.
So despite looking – to this eye at least – a little archaic, The Daily Telegraph Style Book has it right!