TREDEGAR House, in Newport, is trying to reduce the use of single use plastics (SUP).

A spokeswoman for the National Trust property said the charity's environmental policy commits them to utilising every opportunity to minimise their use of non-renewable resources, and to minimise waste.

She said single use plastics represent a particular concern to use because of the environmental impact of their manufacture and disposal.

Matt Drew, head of food and beverage at the National Trust said: "As a charity that looks after 775 miles of coastline, we are alarmed by the impact single use plastics have on our environment, our oceans and marine wildlife.

"We’re committed to eliminating the use of single use plastic in our cafes and tea rooms, whilst ensuring that any disposable packaging we do use has as little impact on the environment as possible”.

The spokeswoman said they are taking similar steps across all its operations to remove single use plastics, and to minimise waste in general

She added that, so far, the charity has taken several steps to reduce and replacing single use and other damaging plastics. These include replacing all disposable food and drink packaging with products that are fully biodegradable, made from recycled and plant-based materials.

"This includes take-away coffee cups and lids, drinking straws and sandwich boxes already in use across its food outlets," she added. "We have trialled a reusable hot drinks cup and a full roll-out is anticipated by the summer accompanied by an incentive scheme to encourage the use of keep-cups.

"We will also be introducing a refillable water flask in the next few weeks.

"For a number of years, we have not had single use plastic bags in our shops, replacing them with paper and jute alternatives."

She said they have committed to remove all single use plastic bottles in their cafes by 2022, but for all their sit-down cafes they will swap to glass bottles by the end of 2018.