Here's a bite...
Right Alfred the Great...you have got my blood up.
A ship travels at 12-20kts, so unless it's in the right place already, everyone who survived the crash at 30W will probably die. It takes too long to get to the scene and conducts a slow search.
A Long Range MPA travels at 300+kts, so some people who survived the crash at 30W might survive because timely and accurate location is more likely, Apparatus Sea Rescue can be thrown at the survivors, some of whom might just be able to climb aboard.
The UK government took a conscious decision to do away with that capability.
Next.