donald_of_tokyo wrote:Sentinel-class cutter (or Damen 4708)
That's about it.
But the grass is always greener on the other side of the fence; we should have bought the whole class, instead of the 'singleton' HMC Protector. Slightly bigger, slightly slower:
Displacement: 434 t (427 long tons; 478 short tons)
Length: 49.7 m (163 ft)
Beam: 7.3 m (24 ft)
Draught: 3.65 m (12.0 ft)
Installed power: 4,800 kW (6,400 hp)
Two Wärtsilä 12V200 engines 
One bow thruster
Speed: 22 knots (41 km/h) , as per Wiki
Now going back to how you operate "your own airforce" to direct these scarce assets in the most efficient and effective way:
"Six pilots and three operators will be employed to ensure year round crew coverage. It is anticipated that many of the crew will transfer over from the current contractor from 1st April. Highland Airways will also employ additional operations and engineering staff to support the new contract."
- that equates to the 1.5 crew rule, to maximise availability
And in the Scottish contract's case, the operator was qualified to do in-house maintenance, so the extra bods needed for the upkeep of two more a/c were not many
... RVL seems to be the operator currently (on the English side); don't have those details