A letting agent that by chance discovered a tenant sub-letting through Airbnb is to be featured on a prime time TV programme tonight.

The agent, Base Property Specialists, then found that the property had received more than 70 reviews on Airbnb since the tenancy had commenced.

Neither the landlord nor the agent had any idea that the tenant had been ‘professionally’ sub-letting the property, in Bloomsbury, London, and the agent ended up £10,000 out of pocket.

The tenants had a 22-month AST arranged through Base Property Specialists.

During a periodic inspection, consented to by the tenants, the agent arrived early to witness the tenants checking a family into the property. On returning to the office, the agent viewed Airbnb to find the property listed both as a single dwelling and as two separate bedroom rooms.

Airbnb had more than 70 booking reviews for the property, with the first being the same month that the tenants’ tenancy commenced, showing they had been sub-letting it from the beginning.

Base Property contacted the tenants informing them that they were breaching a number of licensing laws and instructing them to remove all listings from Airbnb (and any other sites they may have used), cancel all bookings, remove the key safe they had installed and make good any damage that had been caused.

The tenants were offered two courses of action: to re-occupy the property themselves or surrender under the contractual early termination agreement, which at that point totalled £4,295.

Despite the tenants requesting to stay and subsequently removing the key safe and repairing the damage, Base Property continued to receive reports from neighbours of people coming and going. When the agent arranged for a plumber to fix a maintenance issue, he was told by the occupants, a Russian family, that they did not speak English and were renting the property.

Commenting on the case, Kristjan Byfield of Base Property said: “One thing I found extremely disappointing was Airbnb’s refusal to take any action whatsoever.

“When we contacted them and provided evidence that the ‘hosts’ were not the legal owners of the property and were in breach of the landlord’s mortgage and buildings insurance terms, local licensing laws, and both short-term let and HMO licensing, their response was ‘take it up with the tenants’.”

By this point, the tenants were refusing to engage with the agent. They continued to host on Airbnb despite denying it, even using a professional laundry service to prepare the beds.

They refused access to contractors who were due to fix a leak, causing further damage to the property.

Byfield called in the help of Paul Shamplina of Landlord Action who served the tenants with a Section 8 notice and subsequently issued possession proceedings.

Shamplina said: “Kristjan and his team had done everything correctly. They had obtained thorough references, carried out regular property inspections and even given the tenants the opportunity to put the situation right when they were caught out.

“Unfortunately, unauthorised use for short lets is a growing problem, and councils are struggling to cope with the volume of cases. At Landlord Action, we always have a number of sub-letting cases at any one time, particularly from landlords whose tenants have sub-let via Airbnb without consent.”

Byfield called on Airbnb to do more to prevent unauthorised hosts using its site.

He said: “We have had a number of cases where the landlords agree for the tenants to sub-let, and with proper communication and agreements, it can work very well.

“However, 95% of issues such as this case could be eradicated if Airbnb invested in some simple technology to cross-reference the name of the host with the owners name, via the Land Registry, and then simply obtained proof of consent to sub-let if those names do not match.”

The case is featured in Inside Out on BBC1 London region this evening at 7.30pm. Viewers outside London can see it on Freesat 950 or Sky 954.