See the locum for the referral. Can you make non urgent apts in advance with the permanent doctors. Change doctor?
If you look up sabpcamhs you should get a signpost to Beacon, their new layer of bureacracy, but they are helpful.
It's a managed campaign to get help. GP, Beacons advice and following up everything, calling the office weekly etc, getting the GP to write to remind, if you don't hear.
East Surrey CAMHS has historical issues with poor service and attitude unfortunately. Pressure the CCG if they don't provide help, it's the CCG who commission their services.
Just remember and keep repeating "early intervention prevents escalation and is more cost effective in the long run.
Alternatively, you may, if you can, have to bite the bullet and pay.
Also, write to Chris Grayling if you don't get any joy. He's your local MP and its his job to get this stuff sorted out.