He may have done, but if he did he was either repeating an old joke, or reinventing an old joke, or being incredibly stupid and not realising that what he was repeating was an old joke.
Here's a sighting of it in the UK House of Commons, from early May: <http://www.parliament.the-stationery-office.co.uk/pa/cm200102/cmhansrd/cm020502/debtext/20502-29.htm> [scroll down to 5.58pm]
And this one is the same joke in the Welsh context, but told in Scotland in 1999 (before anyone paid any attention to W.): <http://www.mlove.free-online.co.uk/Wittins_73d.html>
C. --
Phone: +44 (0) 1865-286793 Email: <chris.brooke at magd.ox.ac.uk> Web: http://users.ox.ac.uk/~magd1368