Packed lunches - much cheaper and often tastier. I often take soup into work.
Avoid buying coffee etc., from coffee shops. Maybe try taking your own drinks into work if you buy cans of Diet Coke or whatever - especially if you have access to a fridge.
Read news online (I often buy newspapers, but usually BBC online is more than adequate.)
Invite people round for drinks instead of going to the pub.
Don't go shopping unless you've got something specific to buy.
Like yourself, I can see the obvious solutions, but don't always succeed in implementing them myself!
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Like yourself, I can see the obvious solutions, but don't always succeed in implementing them myself!