Following test carried out; Placed body of combination square in the mitre slot on the table saw with blade of the combination square touching the saw blade at kerf end no gap. Sliding the combination square to the front of the blade there is a 2mm gap between combination blade end and the saw blade.
How can the table of the saw be adjusted to bring the table back square to the blade (important needing exact cuts in 2400mm lengths of 300mm wide paneling.) Test cut on scrap revealed the 2mm difference. The saw blade is flat, the saw motor unit cannot be moved/adjusted.
Thanks in Anticipation

Bob, September 2011

It doesn't matter if the blade is not square to the slot or the table top outer edges,you ALWAYS set the FENCE square to the blade,measure the distance of the front of the blade from the fence using a rule lying flat on the table then do the same at the back(don't matter what order you do this)then lock the fence up.Unless you have a precision cast iron table you have to compensate yourself.Set the FENCE SQUARE TO THE BLADE and you will get a perfect parallel cut.Best with 2 people,you feed it keeping up to the fence and someone gently supports the other end(unless your good it will wobble out of line).Practice man practice.

Joiner, September 2011