Jan, as the Salvation Army arranged his adoption wouldn't they still have the placement records?

It would also be legally recorded at the GRO. See: www.gro.gov.uk/gro/content/adoptions/
The law was changed a few years ago to allow birth relatives to have access to the registration details to find out the adopted name and address, etc.

There is also:
British Red Cross
44 Moorfields
London EC2Y 9AL
Tel: 0870 170 7000
E-mail: information@redcross.org.uk
Website: www.redcross.org.uk

NORCAP
112 Church Road
Wheatley 0X33 1LU
Tel: 01865 875000 (see website for opening hours)
E-mail: enquiries@norcap.org
Website: www.norcap.org.uk
Charity which assists and supports adult adopted people, birth parents and other relatives and other people likely to be affected by adoption reunions. They operate the largest adoption contact register in the UK and a skilled intermediary service to facilitate reunions and provide ongoing support.

Sue