Imagine i got my Police check by going through a website.
Looking at the photo copy of the basic disclosure i see no signature there.When i got the notary he was standing next to me as we called Disclosure Scotland to confirm the certifictate real,then he did all his stamps and things to confirm things.
Then i sent to FCO and looking at the photocopy,the FCO confirmed the notary was who he said he was.
Then sent to Philippines Embassy london who confirmed the FCO official was who he said he was.

I was so rushed at the time as it was close to my flight date.Maybe you could give the fco a call and ask them about it if you are still not sure.