Hi Andy,
I wonder wether you mean 137.744 ?
I have had a carrier on this frequency ever since I began on LF,
I discussed it with Alan over a year ago and we decided that it was
local to me. It is very stable and crude DF checks with a loop put it
arriving  north or south but it drops from S9 down to S3 on my NE
Directional EWE antenna,so this pretty definately puts it as coming from the
south or south west,.so since there is very little land  to the S or SW of
me
I conclude that the source is likely to be in France. It would be intresting
if you could DF it we might be able to get a better fix. 73s Laurie..