One factor to take into consideration is if you are happy with a natural cleft to the material or if you want it to be completely flat. When anyone had seen slate tiles for example, the surface tends to contain undulations rather than being flat as per other stone materials. Natural cleft, or riven, can amount to a + or - tolerance of 7mm of the surface requirement. This can also cause problems with inset (fitted from above) sinks.
Also note category 2 granites are not available to get a quotation online as we need to check our stocks beforehand. Please forward to us your kitchen plan with 2 or 3 choices from category 2 granite worktop options and we will come back to you with your quotation amount. We look forward to hearing from you.