I visited Grand Tailor the other day. It was very impressive. I watched the tailors draw, cut their own patterns and all buttonhole are sewn by hand. However, they do not know how to do milanese buttonhole. 6k for CMT. They have a good selection of English fabrics but mark up is in line with other tailors in Central. A no name brand English fabric would cost about 9k.
We had an interesting conversation. They prefer to fuse the fabric and put a full canvas underneath for Italian fabrics as they are very soft and would need structure. However, for traditional English fabrics would not need to be fused as it will have its own structure.