Hepworth said here on this groups when the question was asked about
cutting
their pipe:

"The inventive can find many ways of achieving a perfectly acceptable
clean,
square cut using a variety of tools."

Let's expand this to include the whole quote:

"We do recommend the use of a Hep2O pipe cutter, however any pipe cutter
designed to cut plastics pipes should be suitable. One of the major
advantages of a purpose designed cutter is speed, however the requirements
for the cutter are that it should cut the tube square without scoring or
scratching the pipe or leaving burrs or swarf which could get under the 'O'
ring. It is for this reason that hacksaws should not be used.

The inventive can find many ways of achieving a perfectly acceptable clean,
square cut using a variety of tools. "

Note the line "It is for this reason that hacksaws should not be used."

Christian.