Glaswegian Grant Thomas has been named British Underwater Photographer of the Year 2018.

Thomas now lives in New Zealand. His photo of swans called Love Birds was taken in Loch Lomond, Scotland.

Among the category winners is New Zealander Simone Matucci for Dancing with the giants.

The British-based awards were judged by underwater photographers Peter Rowlands, Martin Edge and Alex Mustard.

Wide Angle Winner Greg Lecoeur (France). 'Humpback whale spy hopping'. Photo / Greg Lecoeur
Wide Angle Winner Greg Lecoeur (France). 'Humpback whale spy hopping'. Photo / Greg Lecoeur
Macro Winner Shane Gross (Canada). 'Seahorse Density'. Photo / Shane Gross
Macro Winner Shane Gross (Canada). 'Seahorse Density'. Photo / Shane Gross
Behaviour Winner Filippo Borghi (Italy). 'The Fisherman'. Photo / Filippo Borghi
Behaviour Winner Filippo Borghi (Italy). 'The Fisherman'. Photo / Filippo Borghi
Portrait Winner Tanya Houppermans (United States). 'A sand tiger shark surrounded by tiny bait fish'. Photo / Tanya Houppermans
Portrait Winner Tanya Houppermans (United States). 'A sand tiger shark surrounded by tiny bait fish'. Photo / Tanya Houppermans
Black & White Winner Borut Furlan (Slovenia). 'Crocodile reflections'. Photo / Borut Furlan
Black & White Winner Borut Furlan (Slovenia). 'Crocodile reflections'. Photo / Borut Furlan
Compact Winner Simone Matucci (New Zealand). 'Dancing with the giants'. Photo / Simone Matucci
Compact Winner Simone Matucci (New Zealand). 'Dancing with the giants'. Photo / Simone Matucci
British Waters Macro Winner Henley Spiers (United Kingdom). 'Battle of the Tompots'. Photo / Henley Spiers
British Waters Macro Winner Henley Spiers (United Kingdom). 'Battle of the Tompots'. Photo / Henley Spiers
British Waters Compact Winner Vicky Paynter (United Kingdom). 'Scratchy Seal'. Photo / Vicky Paynter
British Waters Compact Winner Vicky Paynter (United Kingdom). 'Scratchy Seal'. Photo / Vicky Paynter