My guess is he doesn't have a tree on there either. His comment when he contacted me via GR stated
"You had made an amendment to a census transcription on Ancestry which gave me your address.
Could not reply to your reply through ancestry so am using GR".
I've just been on to Ancestry and did a random search to find a name that had been corrected. I clicked on View/Add alternative information (if no-one has added alternative information it just states Add) and it gave me the name of the person who had submitted the info (well probably the name the person uses on Ancestry). Clicking on the name brings up the person's profile and their interests - presumably if they've added anything - but also a box to click to contact the person.
I'm surprised that having contacted me that way, he couldn't then reply to my answer. Perhaps something to do with neither of us having a tree on Ancestry.
Lizzie
ps. Just found one of the corrections I did. Not only was the surname transcribed wrong, the place of birth which should have been Boston was mistranscribed as Preston (Lincolnshire!!). In my correction about the name, I also mentioned that although I didn't think they corrected place names, the place of birth should be Boston, and not Preston. Much to my surprise there is also a correction for this.