The velodrome visit by UKAD, reported by The Telegraph, came after British Cycling earlier said it was cooperating fully with an investigation by the anti-doping organisation into "allegations of wrongdoing within cycling."
These latest moves appear to be an escalation of that initial investigation into Team Sky and former Tour de France winner Bradley Wiggins.
"In order to protect the integrity of the investigation, we will not comment further," UKAD said on Friday.
UKAD was investigating an alleged delivery to team Sky in June 2011 of a medical package after the Dauphine Libere race and ahead of that year's Tour.
Team Sky said they had been contacted by the Daily Mail about that incident and immediately conducted an internal review to establish the facts.
"We are confident there has been no wrongdoing," it added. "We informed British Cycling of the allegation and asked them to contact UKAD, who we will continue to liaise with.
"Team Sky is committed to clean competition. Our position on anti-doping is well known and we 100 percent stand by that."
In a statement, British Cycling confirmed that "there is an ongoing UKAD investigation with which we are cooperating fully.
"We are unable to comment further at this stage."
