Grupo Ferrin provides bus service from Muxia to Santiago. At time of writing there are two buses per day. There are differences in departure times weekdays, Saturdays, and Sundays.
Monbus (Empresa Monforte) operates buses from Muxia to Cee four? times daily. Monbus (Castromil) operates buses from Cee to Santiago several buses daily. The Monbus site will not provide an answer for Muxia to Santiago. The bus station in Cee is central downtown.
There are flights from Santiago to London. At time of writing there are Easy Jet flights to Gatwick and Ryan Air flights to Stansted. There used to be Air Iberia flights to Heathrow. I guess the flight schedules change with the seasons ... It takes at least 3 hours to get from either Gatwick or Stansted to Heathrow by National Express bus.
My experience is taking the bus from Fisterra at 0930 and arriving at Santiago train station around 1230. I caught a train to Madrid later that afternoon arriving at Madrid around 2100. An all day evolution. The next day I went from Madrid to London Gatwick and by bus to London Heathrow ... another all day evolution.
Grupo Ferrin
http://www.grupoferrin.com/index.aspx
Grupo Ferrin Schedule
http://www.grupoferrin.com/gestion/descargas/docs/Santiago - Bertamirans - Negreira - Muxia.pdf
Monbus
http://www.monbus.es/es
Santiago Airport
http://www.aena.es/csee/Satellite/Aeropuerto-Santiago/es/
National Express
http://www.nationalexpress.com/home.aspx[/
Thanks so much. We have sorted flights from Santiago to London, transfer to Heathrow then fly to Australia. That's going to be a MASSIVE day or so..... Just need to sort a bus from Muxia to Santiago. Thanks for your info Pene