When our editor in-chief wrote “Reviewing top end hotels is a pox of the profession” earlier this year, he was right. My perception of what an exceptional hotel is has changed dramatically over the past five years. I used to be pleased when the check-in desk ork knew my name. Now I expect a fanfare on entrance and an en-suite with sinks overflowing with Chanel, whilst a suitably tailored gentleman complements me emphatically about my Aspinal luggage. Life has changed in many ways. Life in Knightsbridge, however, hasn’t changed much since serfdom. In a quiet corner of South Kensington you will find No. 11 Cadogan Gardens, built in the 19th…