It's all very strange.
I registered with them many years ago when it was first set up as 1837online. I have remained a member ever since, throughout their name and ownership changes and had few pop ups or e-mails. However, today I had an e-mail which said something like now that you have looked at the 1939 Register, explore more about your ancestors on the 1911 census, etc., etc.
Surely, by now, they would realize that, having been a member for all that time, I might have possibly explored their records looking for my ancestors.
