Welcome back.
Your right when you say you wish to locate rather than catch..
You obviously know your Roach, location is one thing, catching a completely different story.
I have always found that the best resource are the more mature memebrs of the local angling community, they have already caught their fish and if your prepared to listen to their catch stories then some good info is usually in there somewhere.
It took me 4 years and many many long chats before I discovered the better locations, some of which I still cannot fish because they are 'private', and then a few more to catch a few of the fish I was after.
Now I only visit my hotspots once or twice a year, to see if the residents have grown any bigger
Whatever, please keep us all informed how you get on, no locations, just a quick update.
PS
Whatever you do ignore completely the information provided on club websites especially RDAC and CAC.