It may help you to know that the terminology for civil cemeteries (such as Blaydon) was, on the whole separated into Consecrated and Unconsecrated Sections.
That just means that one Section of the cemetery The Consecrated Section was (as a sort of job lot) consecrated according to to the Anglican / Church of England rites as that was the established Church in England.
Other sections were described as 'Unconsecrated' - which meant that they weren't included in the area consecration according the to C of E rites - and a ceremony was performed at each grave, according to the religion of the person who was being interred or not at all if they didn't have a preferred religion
In the case of Catholics there may well have been a full Requiem Mass at a church for the deceased , followed by a ceremony to consecrate the actual burial plot according to the rites of the Catholic Church at the time of burial. So , still consecrated, but to the deceased's chosen religion.
For other religions (Methodist etc) a ceremony at the grave plot would consecrate the ground according to 'their' particular rituals.
Does that help to explain?
If your email to the cemeteries dept hasn't 'gone' then check the email address you used it soften easy to mistype an email address.
In my experience the Cemeteries Dept are helpful, look at that website again and see if there is a telephone number that you maybe could try.
Tell them the name, date of burial, Grave no and burial date and ask if it will be possible for you to arrange to have a a gravestone erected.
If I were you I wouldn't even think of travelling until you have spoken to them and found out what is possible.
if I haven't explained properly please come back and everyone will do their best to help
Boo