Peter – certainly a fine advert for using soil blocks for lettuce – I may well emulate you for my second pick-and-come-again sowings which will be done at the May full moon. The first set are doing fine after being picked out of modules, but they were rather smaller at transplantation than yours are.
My blocker is a 1.5 inch block size, so I guess my plants are smaller at transplant than yours. Perhaps I will acquire a 2 inch one as well next year…….