I'm so sorry to hear this - know exactly what you are going through. Please try and spread the word on social media (Facebook and Twitter) - it has an enormous impact. Bus drivers and taxi drivers are also very good for looking out for people and will stick up fliers on their transport. If the police tell you they have searched an area, take it with a pinch of salt and get friends and family to search too.
Man of Kent is fine. Pyro has a cow of a landlady if your accent is English. Fortunately they are selling up. Castle sweet. Now closed but scariest pub I knew was in Peckham near police station (Beehive?). It's closed down now, but had a weird landlady and doilies under everything. When I walked in the whole pub stopped talking - only other time I've experienced that was in Carlisle.
I'm dentist/needle phobic and attended Kings this week. The advantage is that all dentists/x-ray/extra personnel are all geared up to dealing with wimps and cowards and are brilliant so your son's experience will be positive and it might restore his faith in dentists. I have a wonderful dentist called Mina at the dentists opposite Peckham Rye Station. She is so kind and sweet and patient and I can thoroughly recommend her. The number is 020 7639 4422.