Well of course they earn well above the average wage, sure the average wage in the UK is a pittance! Yes they're both in the top 1% of UK earners, but many normal people are. It's only £180K pre-tax to make the top 1%, which really isn't massive in this day and age. Of course, it's a hell of a lot more than average, but average earners aren't going to be able to afford the expensive properties.
I disagree, my BIL/SIL work very hard, they are no more privileged than many other folk. They've just always been sensible, worked hard, knuckled down. They are perfectly normal people who earn very well (in my opinion, but not rich or wealthy). They haven't come from any privilege either.