Paul,
Sorry not to get back to you sooner. I do have quite a lot of info about the Lyall family in the I.o.M., and have actually been corresponding with your mother for a while! However, we are both stumped as to the where my grandfather William Alltree Lyall got to - he seems to have disappeared in the 1930s. If you would like to share information, please contact me off-list. Thanks again, Helen.