Tickle, thanks for the info, is this database accessible to everybody or is it closed? I thought that the numbers of 355 helicopters was more than this as I already have a figure of 380 (approx) for the F series only, I am pretty sure that the N was more prolific than the F? So a total of 609 is not huge, although I note that your figures are only up to 1998. Is there any reason for this?