Came across some good back-to-basics writing advice over on How Publishing Really Works. The bottom line:
Just write every day, and read more often than you write, and your writing will improve.
I am a keen reader, but sometimes when faced with the competing pressures of finishing a manuscript, paying the rent and occasionally having a social life, reading can slip down my list of priorities. I thoroughly agree with Jane, though – it’s absolutely indispensible for a writer to read widely. It’s good advice to keep in mind.