My money is also on the Hilton Wembley Park ..heck last time I stayed it appeared to be staffed by people of said profession
OK jokes aside - I've dealt with Metropolitan Police's finest on many occasions not in a hotel but in a student residence and they have always talked to site management first before being taken to a room and explained the situation for their attendance so can't find it hard to that no hotel staff were aware in this case about the circumstances of the visit.
I hope the Police treated you well in the circumstances and if it was me I'd be reaching for Twitter,USA Today et al about this...someone somewhere made a very poor judgement call....