It is better known in US quilting circles as Kansas Dugout. You can do it on the machine, but it is fiddly and involves partial seams which I've never tried to master.
Here's the hot mess on the back, with pieces of the graph paper still visible. Some of those indigo fabrics are quite thick - I did have some trouble getting the needle through, but no trouble getting it through my finger.
For Monday's Count at Life Under Quilts, this 12.5 inch block has 210 pieces. With any luck I will have finished the last block next week: if I get that far I will count up the grand total.