Business casual in the UK? I am disallusioned - I thought every businessman in London wore a suit with tophat and tails.
Business Casual can be a slippery slope - people dress more and more casually as time goes on and this can get out of hand if not managed properly. One company I worked with had a guideline that I thought was great: "If you get home after work and don`t feel the need to change into something more comfortable, then you were probably dressed too casually.."
I remember Dress for Success well. It was a great book for its time (1970`s) but seemed dated the last time I looked at it. Still contains a lot of useful information, however,