Hi Alan,I'm so sorry for the late reply, I'm not surer how we missed your comment. I'm sure it's probably too late, however they're Bluestone coping tiles with a 75mm drop face. These are available in many different sizes, however i'd be guessing that these were 1000x400mm.
Making a silk purse out of a pigs ear!
POLL: Big house with small backyard or smaller house with a big yard?
Floor plan and facade feedback