( CNN ) -- Those pesky drug testers . Andy Murray received his OBE ( Officer of the Order of the British Empire ) from Prince William for his services to tennis but the man who ended Britain 's 77-year men 's singles drought at Wimbledon in July was in danger of being late at Buckingham Palace because drug testers came calling . Under tennis ' stringent 'whereabouts ' rule , elite players have to tell testers where they 'll be for an hour every day in case they want a sample . And would n't you know , they showed up at Murray 's door Thursday as the grand slam champion readied for his trip to one of the homes of British royalty . `` They turned up at my door at 8.20 a.m. and I had a taxi booked for half past eight , '' Murray , recovering from back surgery , told reporters . `` I was a bit worried I was going to be late but the taxi did a great job in getting us here . `` It 's part of the job but when you have a day like today you are looking forward to , it 's the last thing you need . '' Murray 's moment of panic ended , he traded in his shorts and t-shirt for a smart , dark suit . He was allowed to bring three guests and chose -- not surprisingly -- his parents Judy and William and longtime girlfriend Kim Sears . `` I think they were quite proud , '' Murray told CNN . `` My girlfriend is massively into anything royal . She was so excited about coming to Buckingham Palace for the first time . `` It was a great day for us . '' Whereas Murray made history at Wimbledon and at the U.S. Open a year ago , it was the first investiture for new dad Prince William , who filled in for the 87-year-old Queen . According to reports , Prince William chatted to Murray for nearly a minute -- one of the longest chats of the day . `` He asked me about my back surgery ... and how I was feeling after Wimbledon , when there was a lot of pressure on me , '' Murray told reporters . `` I teased him a bit as he had sent a note to me before Wimbledon wishing me luck and his wife had written me a letter afterward . Her handwriting was beautiful and I told him how fantastic it was compared to his . `` I have met him a few times before and he has always been very easy going . He seemed very relaxed today . '' The decision to give Murray an OBE was actually made at the end of 2012 . He won gold at the London Olympics and a month later ended Britain 's 77-year grand slam men 's singles drought in New York . Murray wo n't play again this season following his surgery , thus missing out on the year-end championships in London in November .
Scotsman Murray received an OBE on Thursday for his services to tennis . Murray ended Britain 's grand slam men 's singles drought this season and won OBE in July . He was given the Wimbledon medal not by the Queen but by new dad Prince William . Murray is recovering from back surgery and wo n't play again July .