BTEC National Diploma Level 2 - Is equal to 5 GCSE's grade C+ (I think)
BTEC National Diploma Level 3 - Is equal to 3 A levels.
I've recently passed my level 2 and onto my level 3, I know most places say to start off with the level 2 if you've been out of education for more than 5 years but that's just so you're not jumping in at the deepend I think
BTW mine is in Health and Social care aswell .. In my college, level 2 was known as "pre-access" and level 3 is known as "access" whether that helps.