Apparently the get outside help in the same way as they do for Salsa etc. I cant remember the couples names that they get in ..Maybe Ralph and Kele or something
Anyway, I think although both Vincent and Flavia could probably provide a lot of good advice to anyone who asked...They perhaps dont want to be treading on other peoples toes who are actually employed by the BBC to help out the couples.
In any other year apart from Mark and Karens, V & F havent really been available to help out anyone else other than each other as one of them has been in the SF themselves, so this other couple that are brought in for helping out have probably been doing this for a couple fo years now on Strictly.
So although it may appear that Vincent has been helping Ricky, maybe its just some advice he has been providing and not actual choreography etc.