Hi doUknow, this is one of the courses in which my team is involved, training healthcare assistants to take bloods.
Our course is a study day which shows you the theory of taking bloods, then you have to go back to your workplace and work with a mentor over a number of weeks - the mentor supervises you undertaking the tasks and signs you off as competent, then you are externally assessed before you get your certificate.
The training can be in different models - some hospital units will take students in, so that they can participate in venepuncture clinics, being supervised while they are training.
There is usually a period of consolidation as well as the actual training.
What you should come out with is a certificate stating that you are competent in taking bloods - our training is accredited by the National Association of Phlebotomists so you should look for some similar benchmarking to make sure that the course is up to scratch (if you will pardon the pun!)
This may help
http://www.nhscareers...s/Default.aspx?Id=252