The IGI can be searched online (on old LDS page) and submitted entries eliminated by adding the batch number to the query. Tried to enclose a link to the "Old" IGI search, but the Board would not allow - "naughty language!).
Isle of Man batch numbers are available online at several sites, just search for "Isle of Man LDS batch numbers".
Any questions, e-mail me at richton at cox dot net.
SAK