Today the programme comes from Kent where Steve Brown makes a jaw-dropping discovery of shark teeth on the beach. And never mind icebergs – the UK has some of the biggest fatbergs in the world! But how bad are they for the arteries of our seas? Plus the programme soars high over Mull with Sea eagles and Chris Packham meets a photographer who believes the UK has the best marine life in the world.

In the final programme looking at the UK's Blue Planet, Gillian Burke investigates whether being a brave crab is a disastrous strategy and Steve Brown will be finding out if herring - the 'silver darlings of the sea' - are making a comeback this year. One man shares his passion for sea horses. Plus the programme will explore the lesser-known British coral reefs and a reflection on life as a lighthouse keeper.