I did post a lengthy reply, but this darn server logged me out, but here's a summary.
http://www.pprune.org/forums/showthread.php?t=307459 will give you an idea of what happens at the medical.
It's unlikely your gp will want too perform the "systems" checks- he won't have the time, and it's probably a little unfair to use NHS resources for this, unless you present with a specific problem.
It's reasonable to ask for the following.
BP/height/weight/bmi/urine testing/blood testing if appropite/lifestyle advice/?peak flow and maybe full spirometry, (more likely if you are a smoker).
Talk to your practice nurse, he or she should be able to offer the above
good luck.