I was thinking about the same thing - literally yesterday... as like you, I was considering the double offer with Alex and Kim yesterday.
But not just yesterday - i also noticed recently that if you look at their twitter feed, they often advertise some last minute gap / cancellation... which was so rare in the past when the schedule used to get filled within 10/15 mins!
And currently, they don’t even have even girls to fill a week.
Not exactly sure why - but I think their price of £200 per hour does feel expensive, this site (and to a lesser extent AW) is helping us to make more informed decisions. I do think that there is a good standard guaranteed there (I visited Gina a few months ago, which was brilliant), but with a bit of research here, you get a pretty good sense of what you are getting into.
Also - they were a little unique in the past with offering domination and full service, but there are a lot more girls with whips these days..