Chris,
There's no doubt about it.....the Algarve really does deliver a super list of birds, with so many of them being scarce/rare/mega in the UK......very satisfying, especially considering how quickly one arrives on site after leaving the UK airport. Cabanas sounds a great birding spot, plus there was clearly no need to bother about hiring a car for the week. My brother-in-law and sister (again car-less) have stayed in nearby Tavira where their hotel was only a short walk away from some great birdwatching salt pans.
You were fortunate to get the Gull-billed Tern on passage; the White Stork which should have left for Africa; and an early Bluethroat which is essentially a wintering bird on the Algarve. Apparently, the Common Waxbills were initially released in Obidos, a small town just north of Lisbon but they seem to have found the Algarve very much to their liking. I had a small, regular group in Vilamoura in May/June 2009, plus that other African exotic, the Masked Weaver.
Finally, Spotted Flycatcher ("common -seen more than Freddy, now") seems to be a very numerous bird in Cabanas, especially for you to have seen over 130 ( presumed different) in just one week ......my own total this summer (excluding young in the nest but including juveniles and all the group birds from the 6 post-breeding/pre-migration sites).
Freddy
PS. you really had me reaching for my binoculars and car keys with your spoof pm saying that you had lots of Spotted Flycatchers appearing outside your bedroom window - ........ Doddington Park, LINCOLN (as opposed to Cabanas, THE ALGARVE) being only a 10 minute drive away from BBH.