Sorry glf, I could have answered better!
The Guernsey operation is one of the 3 main UK offices, others in Nottingham and Fareham.
Guernsey also has 2 warehouses (there are another 15 worldwide) that import and distribute frames to the UK. The warehouses are there for historical reasons - there's not a tax angle!
The King Airs fly scheduled services daily to EGHI and twice weekly to EGNX - and elsewhere according to business needs.