A judge has rejected an appeal from a Kingston man fined for blocking part of the River Thames with his two barges.

The High Court dismissed all of Alistair Trotman's arguments in relation to the original court verdict, labelling many of his challenges about the wording and validity of the Environment Agency's case as "misconceived".

In 2022, Trotman was fined £800 by Staines magistrates' court for breaking navigation, safety and mooring byelaws.

Trotman had been renting out rooms on houseboats Rhythm of River and Kupe, moored in largely the same spot near Hampton Court Bridge for six months from October 2018.

District judge Susan Cooper ruled in favour of the Thames harbour master's evidence. She said the 25-metre-long boats "were likely to affect the navigation of other vessels" in a stretch of water narrowed by Trotman's actions.  

Boats moored permanently without the consent of the landowner can only remain stationary on the non-tidal Thames for up to 24 hours.

The Environment Agency warned Trotman to move the barges or face prosecution multiple times.

But after he was fined, the 57-year-old Kingston resident, contested the conviction and sentence in the High Court, a move the Environment Agency said was "a relentless and meritless challenge" of byelaws governing boats on the River Thames.

Trotman's barges (not pictured) were moored near Hampton Court Bridge. (Photo: Oliver Monk)

Colin Chiverton, environment manager for the Thames at the Environment Agency, said: "This appeal was Mr Trotman's latest contempt for the rules, trying to avoid responsibility for two unsafe barges moored in a dangerous position on a busy river that caused nuisance for river users and residents alike.

"Mr Trotman has never accepted he was wrong, but I am very pleased the High Court rejected all of his arguments about our decision to prosecute."

Trotman questioned the validity of the charges of illegal mooring and refusal to comply with an order to move the barges, claiming the wording wasn't specific enough around where and when the Environment Agency said he broke the law.

But Judge Sheldon responded, saying: "I do not accept Mr Trotman did not know of what he was being accused."

Trotman also believed the Environment Agency should have given him a fixed penalty notice before taking him to court, while also disputing the extent of the Environment Agency's powers to compel him to move the barges. 

Again, the High Court dismissed these arguments; Judge Sheldon ruled most of Trotman's claims against the Environment Agency and the law were "misconceived".

The barge-owner believed the original costs of almost £21,000 against him were disproportionate, and questioned the right of the Environment Agency to claim them.

At the High Court on 16 April, the judge reduced the original costs against Trotman from £20,591.40 to £12,000, but then added the Environment Agency's costs of £10,907.97 for handling the appeal, increasing the overall amount by £2,316.57.

Alistair Trotman's fine of £800 for keeping the boats in place and failing to comply with the harbour master's two notices to move the boats remains. 

Costs for the original case and the appeal total £22,907.97. He will still have to pay a victim surcharge of £80, set at the previous sentencing hearing.

The Environment Agency charged Trotman with 2 breaches of the Thames Navigation Licensing and General Byelaws 1993 in relation to mooring of the barges, and 2 breaches of the Thames Conservancy Act 1932 concerning his failure to comply with instructions from the Thames harbour master to move them.

The High Court's dismissal of Alistair Trotman's appeal against conviction and sentence comes shortly after the Environment Agency successfully brought civil trespass proceedings against the ten owners of other boats moored continuously on the River Thames at West Molesey for several years.