Pre-decimalisation people should be able to deal with the
conversion easily. Normally numerate people ditto. It's not
very difficult, especially in these days when 98% or so of
pupils get A at Maths. GCSE - or is it?

It is when you consider that the other 8% get B or lower ;-)

err... 98% + 8% = 106% ?

clearly you are part of the 2%...

;-)