Golden Oriole sighting???

As unlikely as this sounds I'm pretty sure that I saw a pair (male  & female) of Golden Oriole this morning below Stanage Edge near Hathersage in Debyshire.  The male caught my eye first: bright yellow, bigger than a blackbird, smaller than a wood pigeon, undulating flight, flew out of a tree.  It just went out of sight when I saw a duller bird having the same size and shape and squared off tail, which I took to be the female, fly off in the same direction as the male.

The RSPB website would suggest this is a highly unlikely sighting (too far north) but I can't think what else it might be.  The only other birds I can think off that are this yellow would be Yellowhammer and Yellow Wagtail and it was much bigger than either of them.  Nor was it a Green Woodpecker, though it was that sort of size.

Anyone got any other suggestions as to what this might have been if it wasn't an Oriole?