I usually book official Meet and Greet with Park Via and get avios. Saved my bacon last week when heading to the gate found out that I had left my passport in the car, which was still on level 4. One of the BA hspitality staff went to get the passport from the car and Guest Services moved me to the last flight of the day - the gate called asking for me while I was there. If I had used an off site meet and greet it would have been more complicated. Yes I did give the member of staff a golden ticket.