Christian McArdle wrote:
What is the best method of cutting kitchen worktop to give a nice
straight edge? I have a hand held circular saw and a jigsaw, the
circular has a bit of an aggressive blade however.

You have to cut the top up with masking tape to protect the surface and
to show the pencil line if you use a jigsaw.

The circular saw out of those two. It is not really possible to make a good
cut with a jigsaw, although they are fine for rough work that isn't visible,
such as sink cutouts.

You need to do this outside on some strips of scantling packed level.

For really decent cut, though, you should be looking at a 1/2" router,
having cut it about 3mm oversize with either jigsaw or circular.

This is for a perfect finish with mitred cuts that are to be bolted
together form underneath. The othe cuts can be hand sawn if you are
putting plates over them.

Remember whatever you do that the worktp should be slightly oversize
and fit into a hacked out recess in the plasterwork if the walls are
not perfectly straight and square -which they never are.