The applicant is here in Canada on a visitors visa and DM was made on March 10th , that's when the OP said DM was made. I am thinking that the papers have already been mailed out , to where i don't know. It could be Ireland where he applied from or Canada where he is right now . So airport landing is not an option but to flag pole. At this point i can only suggest she calls London but if the papers arrive and he decides to go ahead without her knowing he has landed then its going to be a hard fight to revoke it, even with condition 51 as at this point we don't have much evidence of any removals. He does have to answer at the boarder and make a statement that the relationship is still on going and no changes to the status ,but will he.
This is so sad to hear Mrs Purcy