Hi BT,
I'm not quite sure why this happened.
I am BN App/flow.
I'm assuming we were on 01 visuals at the time.
I'm guessing that you were part of a group of like type ac in trail from the same direction. We can pull in a group of four or five ac in a 10mile/2minute trail.
This is our most efficient mode.
We have found that while every ac on RNP flies a slightly different profile they are usually slower than ac on visual approaches.
Also with the low cloud and showers around like today it's not good practice to assume you will get a late sight and follow if you look like losing your 3 miles especially when the pilots have your heads down flying an instrument approach.
That can mean having to pull you off the star if speed control doesn't work.
With the RNP it is harder to get you back onto the approach than it is on a VSA.
Also we are under pressure from noise lobbies/check and standardisation to not cancel STARs over land
That said I would have only expected a 1 or 2 minute delay to facilitate the RNP.
This would have delayed some other aircraft as we make a bit more space around you on RNP so maybe the flow on duty decided to put you at the back of the group if you wanted the RNP.
Sometimes approaches like this can have a follow on effect adding 1-2 minutes delay to a number of following aircraft.
Othertimes, if you are No1 and can do a short RNP in IMC conditions, it might save 20 minutes of combined jet holding.
Hope it helps after all it is a team sport.
AA