ONE of Hampshire’s leading conservation groups is calling for a more in-depth investigation into new ferries due to enter service later this month.

The Solent Protection Society (SPS) is worried about the potential impact of the Wight-class vessels, which are about to start operating on the Lymington to Yarmouth route.

Natural England, the Government’s environmental watchdog, is preparing to publish a report into the ferry service and its effect on the Lymington River.

A SPS spokesman said the study would show that the new ferries would add to the damage which had been caused by their predecessors.

“On the basis of this report the Lymington Harbour Commissioners will have to reach decisions on the operating regime of the new ferries,” she said.

“The SPS has grave doubts that enough is known about the factors causing the changes and the detailed link with the ferries.”

The spokesman said wind direction, tidal depth and the speed of the ferries were among the factors that could affect the riverbed and banks.

She added: “We believe that no detailed testing of these potential causes and their effect has taken place.

“The commissioners are placed in a position where they cannot make a scientific evaluation of any proposed new operating profile.

“The SPS calls for an urgent re-assessment of the situation and the commissioning of detailed investigations.”

The issue was raised at a meeting of the commissioners, who have expressed major reservations about the new ferries.

Harbourmaster Ryan Willegers said extensive safety trials had been carried out. Others still needed to be done but the commissioners were waiting for the correct wind and tidal conditions.

He added: “Wightlink would like to introduce the ferries this month.

“What will govern the date of their introduction is the speed with which we and they conclude discussions with Natural England.”

The new ferries are larger and more powerful than the craft they are due to replace.

Campaigners say the 1,496-ton vessels will increase erosion, generate too much traffic and pose a safety threat to other craft.

However, Wightlink say “no substantive issues” have arisen that would preclude the ferries from entering service.

Commenting on the SPS statement a Wightlink spokesman said: “We are aware of Natural England’s report and remain committed to working with them to resolve any concerns they may have.

“We will be in a better position to comment once we have the full findings.”