Worthwhile expense?

The CHASE newsletter that’s just arrived contains details on CEC Summer School, which is a week long entrepreneurial course. Costs £600, and would take up a big chunk of my holiday entitlement… is it worth doing, or is it just more “playing at being a businessman” - i.e. would I be better taking a week off and spending it coding (and having another week or two after this contract [similar cost] to code too)?