I would not say that the Dallam organs are intact, far from it, as each of them has a long story of neglect, dereliction, plundering, restoration good or bad. You will find a detailed assessment in my article "Restoring the Dallam organs of Brittany" in BIOS Journal 20. In (very) short, let us say that the organs of Lanvellec, Ploujean, Guimiliau and Ergué-Gabéric still contain an large part of the original pipework, soundboards and action. The builders involved in the latest restorations, under guidance from the French Ministry of Culture's consultants, are Formentelli, Guilmin and Hurvy, and the musical results are very different. Robert Woolley has recorded Ploujean and Guimiliau (Chandos).