Here is the current list of potential competition subjects:with the latest suggestions added:
1960’s architecture
360 pano
400 feet directly below
A lone tree
A Small Village with a church
Abandoned building
Abstract
Action
After Rain
Agriculture
Arid
Art for Art’s Sake
As seen on TV
Autumn Colours
Autumn*
Battle re-enactment
Black and White
Blue
Boat wreck
Boats with engines
Breweries
Bridges
British Heritage
Canals
Castles
Chimneys
Churches
Cinematic landscape
Circle
City Skylines
Cityscape
Cliff edge
Cliff Face
Clock Tower
Colours
Construction
Contrasts in nature
Council house
Cranes
Crops
Curves
Demolition
Different/Unusual perspectives
Emergency vehicle with blue lights lit.
Fairs & Fetes
Farm machinery in motion
Ferris wheel
Folly’s
From underneath
Fun Fairs
Golden hour
Golf course
Gothic
Graffiti
Harbours
Harvest*
Heavy Haulage
Heavy metal
Here’s looking at you (Drone from drone)
Heritage railway
History
Holes#
ICM (intentional camera movement)
Indoors
Industry
Iron Age/Roman Forts
Jet Skis
Lakes
Landscapes
Landscapes without Buildings
Lavender fields*
Life boat / craft
Light
Light Trails
Lighthouse
Lights
Long exposure (night)
Marinas
Mazes#
Military Sites WW1
Military Sites WW2
Monochrome landscape
Monument
Motorway services
Movie Titles
Moving vehicles
Moving Water
Murals
National Trust properties
Nature
Nightshots
Non League football ground
One colour only
Outdoor swimming pool
Oval
Patterns
Patterns in the Landscape
Picnic
Piers
Places of worship
Portraits
Ports
Prehistoric
Public Transport
Red
Religious retreat
Repurposed
Rescue
Reservoir
Rivers
Roads
Rocks
Rooftops
Roundabout at dusk
Seascapes
Shadows
Shiny#
Song Titles
Sports Grounds
Spring*
Square
Stadia
Still Water
Straight Down
Straight Lines
Summer*
Sunflowers*
Sunrise/Sunset
Symmetry
Tall chimney
Tallest
Tilt Shift
traffic
Trains/Trams
Trees
Trig Point
Ugly buildings
Victorian engineering
Was a cinema.
Water Tower
Water#
Waterfalls
Weight
Weird and wonderful traffic islands!
White Lines#
Windmill
Winter*
Xmas lights*
Those with asterisks are seasonal so the randomiser will ignore those when it is not possible to find the subjects 
We have decided that we can keep previously selected subjects in the list as no one seems to mind. Ay least, that is, that we have had no complaints that the current competition - Moving Water - was run in November 2020!