Planting in one's yard, to attract birds and butterflies, will produce endless opportunities for interesting images, in all weather. This can be enhanced by establishing perching opportunities that certain species may favor.
Allow a spider to live inside a window, and occasionally allow a fly to enter the home. Stand ready with a macro lens!
Sites such as Strobist.com present fresh ideas quite often. Some are inexpensive projects that use self-built, inexpensive materials.
Local groups in the UK may organize what we in the USA call photo walks.
One question-and-answer site recently discussed the best lens for a specific purpose. The host recommended the questioner use one fairly fast (f/1.8 ) fixed-focal-length lens for a whole year, developing familiarity, so that the photographer learned to see everything from the perspective of that focal length.
Photographer/blogger Eric Kim recommended photography books. Joe McNally recently recommended photography books. The common thread was to read more. I just acquired _An Inner Silence, The Portraits of Henri Cartier-Bresson_. It is full of inspiration, to say the least. Moreover, HCB did just
about everything, photographically, with one or two lenses.
There is a saying that when life provides lemons, make lemonade. Make a project of photographing cloud formations!
These are just some ideas.
