Can I confirm that the actual supplied blade is only about 12/16 tooth.
surely I dont want to be attempting to cut the worktop or even units
back with that do I.

I was hoping the summit or silverline blades might be ok since they are
quite a good price, has anyone never used the summit ones.

I have read various opinions online about setting the depth some seem
to say to adjust it to slightly deeper than the cut by say 5mm or so
but opinion

It is black worktop so not chipping it is essential as guessing it
would show really bad