Grant Miller, senior officer on the Convention on International Trade of Endangered Species (CITIES) Border Force team at Heathrow has said the market in endangered animal items being trafficked into the country is evolving.
He said there is a significant increase in items in such as ivory from west and central Africa being trafficked through London's "logistic hub".
"We pick up between 5-15 kilo of ivory at time. The heartbreaking thing is it quite clearly new ivory from recently slaughted elephants."
The number of poisoned dead Elephants at the Hwange National Park in Zimbabwe has risen to 91, wildlife officials have told the Associated Press.
The elephants were poisoned with cyanide by poachers who hacked off their tusks for the lucrative illegal ivory market. ITV News correspondent Martin Geissler reported on the devastating attack last week.
Officials say cyanide used in gold mining was spread by poachers over the flat "salt pans". They also say lions, hyenas and vultures have died from feeding on contaminated carcasses or drinking nearby.
Nine suspected poachers have been arrested this month after the biggest, most brutal poaching spree on record. Three men were sentenced to up to 16 years in jail.
Conservationists in Africa are injecting poison into rhinos to protect the speciesRead the full story ›
Chinese authorities will find it difficult to argue that they are dealing with ivory demand when it remains easy to buy in market places.Read the full story ›
The attack on an elephant skeleton at the Paris Natural History Musuem is the latest in a series of thefts from people looking to cash in on the lucrative trade in ivory and rhino horn.
Rhino horn is worth £65,000 a kilo, which makes it more valuable than cocaine, heroin and gold.
In 2011 rare black rhino horn was stolen from Druzilla's Wild Life Park in Sussex.
In 2012 staff at the Powell-Cotton Museum at Quex Park in Birchington had to replace valuable rhino horns with fakes after they were hacked off the exhibits by the thieves.
Volunteers are currently helping to man 24 hour patrols of rhino enclosures at Port Lympne and Howletts Wildlife Parks after police received information that criminal gangs were hoping to poach the creatures.
A man is being questioned by police after he allegedly hacked the tusk off an historic elephant skeleton in the Natural History Museum in Paris.
The museum said that staff were initially alerted to the theft after they heard a chainsaw being used in one of the galleries early on Saturday morning.
Police arrested a man near the museum after he was spotted carrying the three-kilogram (seven-pound) tusk. A chainsaw was recovered from inside the gallery.
The popular skeleton was given to King Louis XIV of France in 1668 but the tusks were added at a later date.
An international conference to halt the rise in ivory and rhino horn poaching ended in Bangkok, with campaigners feeling 'disappointed'.Read the full story ›
Hundreds of ivory items worth almost £1.3 million have been discovered for sale online in Europe over two weeks, Interpol has revealed.Read the full story ›
Thailand is playing host to an international summit on the protection of endangered species and its prime minister has vowed to work towards banning her country's trade in ivory.
Last year, as many as 32,000 elephants were slaughtered worldwide for their tusks and 668 rhinos were poached for their horns in South Africa.
The biggest market for smuggled ivory is China, which is also facing increased calls for government-run market in ivory to end.
ITV News' Angus Walker reports.