I remember (sor of) this from Rugby Bus days - -

Stop the bus, the driver wants a wee wee,
Stop the bus the driver wants a wee wee,
Stop the bus the driver wants a wee wee,
A wee wee cup of tea!

Also -

The front of the bus they canny sing, canny sing, canny sing
the front of the bus they canny sing -- - (can't remember the rest of it?- -
Not convinced it is part of the same song -- ???
the front of the bus then sings the same verse, substituting 'the back of the bus' etc)