Image caption (Left) The photo of the slide on the rocky tidal island that Bear Grylls (right) tweeted

TV explorer Bear Grylls is facing a planning investigation after installing a slide into the sea on his island holiday home on the north Wales coast.

The father of three who owns St Tudwal West, off Abersoch, Gwynedd, wrote on Twitter that when using the slide "you hit the water very fast!!!!".

Ward councillor Wyn Williams said he had concerns over safety and whether the slide needed permission.

Gwynedd council has been asked to comment.

"As far as I'm aware, he uses it about two-to-four hours a day and it's used by the family itself," Mr Williams said.

"When the tide is in, that's not too bad. When the tide is out, there's quite a lot of rocks.

"I'm not sure if he needs planning permission but I think he should have notified the council."

St Tudwal West lies around just over half a mile (1km) off Gwynedd's Llyn peninsula.

The rocky grass-covered island is about 700m (2,000ft) long and 200m (650ft) wide.

In July, Mr Grylls, who is also the UK's Chief Scout, submitted plans to build a harbour on the island close to the existing landing stage.