I suspect that much of the information at this web site is already familiar to you:
http://www.learndirect-advice.co.uk/helpwithyourcareer/j obprofiles/profiles/profile1100/
The key piece of information from that site seems to be this:
"A background in careers advice and guidance, youth work, education, youth justice or social work is particularly useful".
Looking at which of those areas might offer you the best (and quickest) path to your ultimate career aim, I would suggest 'youth work'. This took me here:
http://www.learndirect-advice.co.uk/helpwithyourcareer/j obprofiles/profiles/profile300/
As well as reading the information on that page, I suggest that you check out some of the links (particularly, perhaps, the one for the National Youth Agency).
Hoping this helps,
Chris