Hi
@Brian J Galbraith. Congratulations on planning your first Camino. The Ingles is a lovely route.
Vueling direct flight from Gatwick to A Coruna then one of the very regular buses to Ferrol is probably the easiest option from London. If you have the time to stay in A Coruna it is a beautiful and interesting city and a day or two is worthwhile. Alternatively, fly from Gatwick direct to Santiago and then bus either direct to Ferrol or take the train or bus to A Coruna (again you can take advantage of a day or two in the city) and transfer by bus to Ferrol.
I am flying out to Galicia in October into A Coruna and back from Santiago, both direct flights and at reasonable cost. I have used Vueling on many occasions to A Coruna (usually out of Heathrow but the direct flight has now switched to Gatwick) and never had a problem with them. A Coruna is also a great airport to arrive at as it is pretty small so transfer from the plane to the bus into the city is quick and painless.
Good luck with your planning.