Revealed: the equine drugs seized by police on Dubai government jet Princess Haya revealed to The Guardian on Monday that she and Sheikh Mohammed had ordered the internal investigation after reading earlier this month about the Stansted seizure, which she said was the Sheikh's first knowledge of the drug haul from the jet. A spokesman for Princess Haya said: "He was deeply troubled by this development and immediately asked Princess Haya to take action to ensure that these kinds of management failures never happen again." Telegraph Sport has seen a full list of the products seized from the plane, where they were marked as "horse tack"." It includes Pentosan Gold, a calf serum extract used in joint treatment, which is not detectable in dope tests. There was also Naquapaste, an orally administered corticosteroid; Sarapin, a pitcher plant extract which relieves nerve pain and is also undetectable in tests; and Dexaphenylarthrite solution, an anti-inflammatory corticosteroid. These are all banned under any name in the UK. In addition, there were 20 doses of Carbocaine, and three other products associated with injections into joints. Keith Chandler, a leading figure in the British Equine Veterinary Association, had not even heard of the three other substances. He was especially concerned about the quantity of Tildren. A diagnosed case would probably receive just one or two doses a year . Tildren would have a shelf life of 18 months, so I don't understand why any yard of 70 or even 140 sport horses that are only here for a few months would require so much. There is also deep concern about how the drugs were to have been administered. The Royal College of Veterinary Surgeons has examined a list of foreign nationals previously understood to have worked at Sheikh Mohammed's UK stables to establish whether they were licensed to work in this country. It is illegal for any non-members of the RCVS to ­practise in the UK or to administer ­injectables. When the Moorley Farm raid was made in public at the start of September, the BHA said it was not a matter for it to investigate. Asked on Monday whether Sheikh Mohammed's decision to order an investigation of his equine operations would prompt them to seek more details of the drug hauls, a BHA spokesman said their position had not changed. The spokesman said: "We are surprised the article featured in the Guardian has been given such prominence as it contains no notable developments beyond those which have already been widely reported earlier in the summer. The importation of unlicensed veterinary ­products is clearly a matter for the VMD and Defra. It was they who informed the BHA that their investigation had found no link with horse racing and that they were satisfied that the veterinary products were not intended for thoroughbreds. Management and prevention of equine athletic and orthopaedic injuries is a major issue in equestrianism, which is why anti-inflammatories and other masking agents are regarded as "performance enhancing." Endurance riding involves mature horses in long-distance race rides of up to 100 miles.