Luton's bit of airspace. Once in the London TMA under control of ATC who vector aircraft around the sky, not down to flight deck as to exact timings on approach etc. If the Arrows were planned through and all the agencies were talking to each other, a slightly different speed or heading requirement earlier on for the Monarch would have solved the problem.
The last thing on busy airways anyone needs is bikering, back chat etc . Let the guys do there jobs, all three parties, keep it safe and standard. It's easier to comply than winge. This applies to all us professionals.