I don't think spending a couple of years at night school doing the 2330 will ever be wasted, as long as you can find a course at the right price. Mine cost approx £400 a year, which I found acceptable. With the underpinning knowledge, one can then find work as a 'mate' (more needed than sparks) and eventually secure the NVQ side of things. At the end, you will have qualifications AND experience. The thing NOT to do is give up a secure job right now, and try to dive headlong into a struggling and recession prone industry.
Why oh why do we have people posting on here day after day with the same questions? These short courses will NOT result in you becoming a qualified electrician. They will clean you out, and leave you high and dry. You don't need any qualifications to work in the industry as s 'mate', often paying just a couple of quid shy of what the sparks are getting.
There is less and less incentive to get the quals, when you can get almost the rate anyway.
Get a CSCS CARD, GET ON SITE, GET STUCK IN.